Hey

I used to play on Pacific only, but I have switched to pp. You can make a higher hourly rate on Party because of the xx-tabling. I wouldnt play the 5s on party due to the 20% rake.
The main reason I still play pacifics 33s is, that it helps my postflop play, which is like non-existing on party.

To sum up: If you wanna grind xx tables 24/7 party is the place to be, if you want to make smart moves and play more postflop with a bigger stack, Pacific gets my vote.