Some context; Paradox tends to add quality of life options to their games over time. Options that are good will expand to all the other games. This means that over time, games that are 'current' will see endless QoL improvements, while games which are no longer 'current' do not.
If I only compare games to the state they were when Victoria 2 ended, Vicky2 wins by a mile. However, since quite a bit of time has passed since then, I have to report the following:
1 - Stellaris - just awesome and fun to play. Yes there are bugs and issues, but I rarely run into them myself, and what bugs there are, do not tend to destroy a run for me. The biggest 'downside' for me is that when something new is announced, it really gets my imagination going, and I thus find it difficult to play a game when I know what is up next but do not have it yet; pending on what that thing is. IE a new starbase DLC will make me want to play with starbases, but since I'm playing with starbases, I'll see the limitations the DLC is to fix, and thus feel I'm missing out as I don't have the unreleased DLC yet. For whatever reason, this seems to impact me with Stellaris more than any other game. I didn't get Stellaris until 1.6 or 1.7 or something, and I suppose its possible that 1.0 was simply awful, and therefore, the game has 'more room for improvement'. Hours Played: ~700
2 - CK3?? - Brand new, so there's always the possibility this will drop like a stone, especially if they don't add the few options I feel the game desperately needs (like larger councils for more powerful lords) Things are, however, looking quite good, and so, I have high hopes. Hours Played: ~20
3 - EU4 - The 'core' game of the Paradox brand. I love the flexibility it allows me. One game I can be Austria, leaning into HRE mechanics, gobbling up territory peacefully. The next I'm China with Mexican colonies around the local capital of Sino-Loa. The next I'm Portugal and have colonized half of the Americas myself. My biggest problem with the game is that their solutions to being overpowered tend to clash harshly with my gameplay style. Colonial stuff especially. Why can't I build a massive american empire, and instead have to stay in europe with a ton of midsized colonies that neighbour one another. Hours played: ~550
4 - Imperator - We start to get into games I kinda dislike. Looking at how Stellaris developed, and, the direction Imperator has gone since release; I'm pretty confidant many of the concerns I have will be addressed in time, but, right now? The game feels really really... bland. Like a stereotypical suburban housing district. Imagine that scene from the movie "Vivarium". All the houses are the same. Imperator feels like that. All the cultures are the same. All the religions are the same. All the governments are the same. Oh sure, there are different bonuses, and monarchies are indeed different from republics, but all monarchies are just... near identical. There's no flavour, no spice. My fav part of EU4 is how, even at launch, a game as Portugal felt nothing at all like a game as Austria, and both felt radically different than a game as the Ottomans. Imperator has none of that. I can hardly tell the various republics apart! Still, the game does seem to be going in the right direction, but until it gets there, my desire to play is lukewarm. One of the biggest disappointments for me is that the game is clearly focused on building the Roman Empire. I want to run the Roman Empire! Let me try to struggle balancing all of the demands placed on an Emperor, and try to not get killed. To me that sounds like way more fun than painting the map read. The game it is is too much of a map painter, and too little "the politics of game of thrones" for me to love it. Hours played: ~30
5 - Victoria 2 - Suffering badly from simply not having been updated in years, this treasure hasn't really seen me "play" it in years. Oh sure, I'll fire it up every once in a while and let a decade tick by, but I've not really been able to truly "play" it in ages. It's just too "out dated". Its a real shame. It was the most political game out there, and as I outlined above, I love that. I also love love love the whole "industrial exponential building" part of the game. It satisfies the same itch Factorio does for me. Picking exactly what factory to put where was one of my fav parts of the game. Trying to build stuff to deal with what I expected the economy to be in 5 years VS building it for what it is now! Sadly, I don't think I'll really be able to enjoy Victoria 2 again any time soon until I can get over my mental block over the now out-dated QoL options. Sad really. Hours played: ~350
Last - HoI4 - I really hate this game sometimes. There are just so many easily fixable problems that never get fixed. For example: Liberia has had an advisor bug since release! And I know it was reported, cause reported it myself. But, because too few people run into this problem, they don't care, and it goes unfixed. That's the core of my problems with the game. Just so so many stupid things that go unfixed for far too long. I keep playing the game because I want to like it, I really want to love it, but I keep getting runs destroyed by bugs. In my entire time playing paradox games that are not HoI4, I think I've had to stop a run 6 times due to bugs. 6. In HoI4 alone, that number is closer to 40. The bugs themselves don't have to be major. Maybe I'm Liberia and I'm at war and my new general gets sick. Why does he get sick? Cause its hot out. Never mind that using "colonial troops" was like the thing to do cause locals are immune to this. Too few people play as countries with capitals in areas that get overly hot, so, no nation has generals that are immune. Great; then I get into a close run battle and lose it cause my general was sick. Well pending on the size of my force, that's a potential run dead due to a stupid little bug. Then you have really moronic oversights, like Haiti's generals looking nothing like the population of Haiti, or how for a time Guatemala was in North America along with USA/MEX/CAN, while the entire rest of the area south was part of Central/South America. It's these stupid little oversights that the game is just riddled with from top to bottom. Beyond that, the game has been headed in the wrong wrong wrong direction. They made it easier to re-create modern states on the map, while making it harder to re-create historically plausible states of the era. They made it so that tiny countries can just go off and paint the map if they wish. They made it so that multiplayer games are balanced by screwing with the AI in ways that ruin single player games. In short, the game seems explicitly designed to hurt players who really want to "play as any nation" by telling those who pick nations that are not popular, that they can go [redacted] themselves up the [redacted], as the dev's oh-so-precious time (which they waste making the game a dumbed down map painting program) isn't worth the few players who want to play as your nation of choice. Now contrast that with EU4 which is, as we speak, making a whole DLC for the little played south-east asian part of the game map. Simply and bluntly, this game has been designed so that I have no choice but to hate it, and my only desire is to see that change because it could be the best game of the lot if only the top design decisions were not being made in ways that seem explicitly designed just to irritate me. Hours played: ~700