USPSA is my favorite. Running around shooting as fast as you can, reloading on the move, I love it. IDPA is also fun but has less targets and more rules. Three gun is pretty awesome, I've only shot it a few times. Any of the falling steel shoots are fun. I shot TAC a few years ago, that was pretty cool too. We did a lot of 3D archery shoots when I was a kid. Now it's only once in a while.
I love shooting just about anything. It's one of the only times I've experienced that flow state where you aren't thinking about anything and it feels like you are on auto pilot.