Winning a major tournament can be the beginning of a career. This is possible only in a multi-table tournament.
In the tournament, because of the increasing structure of the blinds, decisions are made easier. So at the end the game on postflop is much simpler.
In the cash game, chips are a substitute for money. The main task of the player is to get a large number of chips. During the consideration of the bet, the main criterion should be an understanding of the situation at the end of the race, this concept is also called "mathematical expectation". In the tournament, the main thing is to last longer in the game, because the place determines the prize payout.