Alby_da_Wolf on 08 January 2017
If I should decide based on my tastes and what catered best for them, I'd say USA and Japan during the first generations and coin-op times, then, since Doom, Ultima Underworld, Syndicate, Gobliiins and Lemmings (to name the oldest greatest ones I can remember I used to play when I started gaming on PC when I didn't even own one) times, Europe and USA. I guess for those that stayed on consoles Japan kept a higher ranking longer and could still keep it.
Edit: the whole North America and not just USA makes the region stronger also for my tastes, but it doesn't change my rankings, since Europe became strong in game development it had some sad SW house deaths through the years, but it remained very strong.
