I've also taken a look at the statistical analsyis provided by each program, but really - there are only so many ways to crunch the numbers... This seems like a heated debate on some forums (thank the Google) and it may boil down to 2 things
1) personal preference
2) does PO support where you want to play (PT supports several more sites)
I'm not sure why some poeple choose PT over PO or vise-versa. For me, I like the real-time odds calculator and I can datamine tables in real time that I'm not playing at (if you have a player at your table who is also on 4 other tables you can get the data from ALL of his hands presented to you, not just the ones you're involved in).
On the other hand more people seem to use PT. Not that I'm a fan of more popular=more better, far from it, but if you need help you have a bigger community to ask which could be an advantage.
Although, you need 2 programs to do what PO does with 1 and that can add a level of complexity...
Additionally.....
De-coder