Due to space and availability, my current game plan is to get a GZ Pro and play the heck out of it for a few months before I can get my DP Pro which my son has wanted for quite some time.
Having said that, I find DP Pro to be just ok. Maybe I need more time on it, but I think the droop flippers and sorta clunky layout, with what seems like playing the same 3 modes all the time doesn't justify all the praise it gets. Again, maybe I'm missing something.
I've mostly played on GZ Prem and love it (only have 1 day on a Pro). I love my AIQ Pro and think I'll love GZ Pro almost as much. AIQ just has more going on as far as BoM and "wow factor" for me. No one mentions that GZ Pro is Elwin's only game w/ 2 ramps and it arguably has the weakest interactive "toy" (IMDN's bullseye target, JP's truck, AIQ's tower & disc...etc.). I really don't count the magnet as a toy because it looks exposed and ugly, but maybe if it had some sort of claw mold over it, it would have more pizazz...? But GZ has such a unique layout that shooting it is a constant joy. Plus the rules seem to have so much more upon plunge vs. DP.
Having said all that, the kiddo wants DP, so if I get GZ now and DP is later ready this summer, I'll have a tough call to make in a few months.