Tight - aggressive style is the most profitable. But it all depends on many factors. What stage of the tournament, in which you position at the table, who are your competitors. And what are your cards.) It is better to be the aggressor with good cards and position.)
It's the mix of both.
Starting aggressive could lead to a big stack at the beginning and you can continue dominating others.
If this strategy fails, don't get tilt and change your strategy. But often your cards will show you the way :-)
i prefer a slow and steady game for the beginning, and with time become a little more aggressive. But even in the beginning, you may be aggressive
depending on your position, other players and their bets.
I think the better style in poker is when other players can't say nothing about you after long game. Not too tight, not too loose or aggressive. When you had ideal balance of it all and opponents don't know what you have got and what to do when you move.