Pokertracker, poker-edge, or something else?

[ilovethisgame]

I've tried the free download from Pokertracker and there's a ton of info. Probably too much. I tried Poker-edge, and while it was easier to use, it didn't seem totally accurate. It also seems like you have to get 2 or 3 other programs to run with it.
I know there are other tools out there, though I don't know what they are.
If you were going to invest in one of these - or another - what would it be and why?