I would choose A. I really like playing alone and grinding it out solo, and I find myself consciously trying hard to be better against other people drains too much energy than I really like. But if I'm in the mood to go and be a try-hard, perhaps going to a PvP casino is the way to go. It's really fun to go against someone that has better skills than you because you'll be learning a lot in how they play and how they respond to pressure which you can definitely use the next time you'll be playing the same game.