Both, because I like to keep the opponent on their toes. If you have smart enough players, you can change up presses and keep the opposing coach playing chess.

Traditionally the 2-2-1, or box press, was been used to slow the opponent's offense down. There are some possible trapping opportunities but it mainly keep the ball out of the middle and takes time. The 1-2-2 naturally forces the ball to the corners and sidelines, giving you many more potential traps. It's your choice as to what you want to gain from your press, then decide which one will help you accomplish that.

I used a 2-2-1 this mid-season and it worked well. I was thinking of being more aggressive next year by using a 1-2-2 so that I can have more opportunities to trap and force quick turnovers

We ran a lot of the 1-2-2 3 quarter court press this past season and had alot of success with it. Like Randy Brown said it forces the ball to the corners so you can get more traps, and we found that it also speeds the other team up if they don't get trapped, thinking they "beat the press" and they end up taking a quick bad shot that they aren't used to taking. We just want the other team to not be comfortable whether or not you get a turnover.

I’ve always preferred the 1-2-2 3/4 to control tempo, we’d drop back into man. I also liked to use it in full court situations when needed and you didn’t have to teach another press.