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.
Same with mine Ill go for A. Although they are luck based games but they can be more challenging especially if you are fighting too with a player that has good skills as you. Either you can beat him, or youll be beaten but at least you also learned from him. And seeing these games have better rewards, then I would always want my luck here too.