I'm working on making two comparisons:
And
- 40% commander bonus (offensively and defensively)
- 15% tech across the board
- No bonuses from cultural buildings
The first of these two should be fairly representative of the very early game or playing as a republic (with city capital), while the second of them should be fairly representative of the mid-to-late game. I can't really be bothered to make more than two comparisons (with values in-between or with other bonuses for the commander ... certainly not for terrain etc.) because it isn't going to change the relative rankings much, and the work is fairly tedious.
- 40% commander bonus (offensively and defensively)
- 60% tech for one, 30% tech for the other two
- Max bonuses from cultural buildings
Don't include the commander bonuses at all. They're multiplied separately to all the others, so if you just remove commander bonuses you're just removing complication.