Casual : You want to have fun with your friends while playing. You prioritize doing fun plays and having an enjoyable game state, and you ultimately don’t mind too much if you win or lose.
Casual/Competitive : Just a mixture of the two groups, you want to win the game to some extent, but having an enjoyable and relatively simple game state.
Competitive : Your ultimate goal is to win the game, and to do it as efficiently as you can within your budget, and you enjoy clashing with other decks and pilots with this mentality, with tough decisions to make and sometimes tricky card interactions.