I think that MTT tournaments are the most profitable discipline in poker. But you need to spend more time on tournaments and you need to have more patience, unlike cash games. You can play a tournament for many hours and make just one mistake, and everything you did up to that point will not make any sense. However, if you make it to the final table in a major tournament with a large buy-in, the pleasure and adrenaline you get will not compare to what you get in cash games. The psychology of the game in these two disciplines is very different from each other. In my opinion, playing tournaments is more interesting than cash games.