Buy the game.

Please advise which version of Heroes is better to buy: the Steam version or the one from Buchka? And is the Steam version only sold on Steam? Can't you buy a boxed copy and activate it on Steam? Where are there more players: on Steam servers or Buchka servers? And I don't quite understand something else: doesn't Steam have its own servers? Isn't there only one server for Heroes VI from Ubisoft? Or did they just split it up by region? Please tell me, those of you who have Steam and Buchka licenses, I'm very interested in hearing about online games. Is there a shortage of people there and there? Or does it really make no difference, Steam or Buchka? In general, I'm going to buy it in Ukraine, but it seems like the same Buchka thing is happening here. And if I buy it here in Ukraine, will I be able to play online in Russia? Is there only one server for the CIS? Thank you in advance for answering my newbie questions and for your patience with my spelling.