I think i'll play both, depends on my mood. Sometimes you want to be alone so then its better to play as lone wolf. But i think playing as a team gives better results in loot and so on because you can do raids and do harder mobs more easily, i still hope there is some challenge in raids because too easy games are not gonna be fun after a while because there is nothing to accomplish. But overal i would play with a team the most to make the most fun out of the game.