Solo, I say RTS and RPG (not every RPG)
Multiplayer, Fighting games at a competitive level. You need to remember every matchup, every combos, every mixup, etc... while analyzing an opponent that you don't know, you must synchronize him and on top of that, you need to change your style and actively think about his plan to make sure that you're the one in control. It's a psychological warfare, like pro chess and such, but at the same time, you need heavy execution skills to win.
Multiplayer, Fighting games at a competitive level. You need to remember every matchup, every combos, every mixup, etc... while analyzing an opponent that you don't know, you must synchronize him and on top of that, you need to change your style and actively think about his plan to make sure that you're the one in control. It's a psychological warfare, like pro chess and such, but at the same time, you need heavy execution skills to win.