In my opinion, Dangerous Waters is more a naval sim while NW:AC is more willing to sacrifice realism for gameplay's sake. So I would say they're different games to a point and you're better off deciding which approach suits you.
Okay. Is NW:AC stabel?
Okay. So witch one do you guys find to be more fun?
It depends. If you able to appreciate rather hardcore sensor systems with you being the operator then you may like Dangerous Waters but if you just like to command and chill then NWAC is probably going to be more fun to you.
In my opinion NWAC is the easier of the two. Dangerous Waters could feel like work sometimes especially with most things on manual.
Just trying to track 3 or more contacts with multiple passive sonars will occupy you like nuts even more for more contacts. Approach, detect, classify, track then engage. It feels like doing chores at times with things at manual. It's fun if you can appreciate all of it and surely quite immersive and I like it A LOT but most people won't I think.
Is there multiplayer in DW?
Yes, you can play cooperative and head to head in DW. I've never done it, but heard it's fun. DW is relatively old by now, so not many people probably play it multiplayer, but if you go to the subsim.com forum, you might be able to find someone there to play with.
As for which is more fun, personally I enjoy DW more. When I first tried the demo several years ago, I got a bad first impression and thought it was boring. But after putting some time into it and reading more about ASW, I grew to enjoy the work that one has to put into it and the feeling of satisfaction you get when you've nailed down the position, course and speed of your target. I guess you have to be a bit of a nerd for this sort of thing. The nice thing about a game like DW is you get to play around with some naval tactics without the pressure of screwing up and consequently making your country look bad or getting someone killed. This is unlike the real Navy, where the work can be interesting, but the consequences for your decisions are dead serious.
I've enjoyed NWAC at times too, but just don't find as much depth and the game's design and stability issues frustrate me.
Is it true what I have heard that there can be multiple ppl commanding same ship for example. Like one uses radar one uses sonar and so on.
And then bit off topic any other good naval/sub sims/games
Yes it's true though I haven't had the opportunity to try that feature ever.
That feature sound really interesting but if no one plays DW online anymore it useless
The game has a small faithful following but you need to join their community. I know of the Polish and French community that played DW online from time to time.
If not you may need to play with a friend.
Check the mod I gave in my first reply. Those community play with them too now. It's a must have. It adds so much.
But it is better not to buy DW for its multiplayer. It has no lobby to connect players just connecting through direct ip input.