Well, up until a few weeks ago, I'd have said WOZ, hands down. It's still their best game. I like it a lot better than Dialed In, and (sorry), Dialed In is a lot better than Hobbit. However, then JJP dropped the bomb of POTC.
I feel like an ass, because I haven't played POTC yet. So my thoughts are just from video and what I know about the game. I think the game has a LOT of potential. It looks like it really has it going on.
So, if I was deciding to buy a JJP game right now, I'd wait a bit. Or, more likely I'd call Jack and ask if I could come down to Jersey and put a bit of time on the prototype to see what was going on. Then I'd decide between POTC and WOZ.