Never tried a ProZone, but the Deli is well behaved and graceful.
Works well for all sizes -- I am 17st / 240lbs but several rather titchy top UK C1 freestylers have been using a deli as well. Over a dozen C1ers I know of were using a deli last year (though some of them are now using sponsor's boats or more aerial-oriented craft like the Pop and Skip).
Stable! It's wide, so stable, but the lozenge shaped hull means that the ends engage extremely well.
Forgiving! Never pearled on me once. Edges don't seem to catch much although I personally catch a few stern edges still, to be expected as it's almost a squirt boat for me ...
Solid! Super bomber constuction, not a hint of oil canning. Best plastic in the business by a long long shot.
Cheap! In the UK either £300 used or Prijon now do a school version with minimal kayak outfitting brand new for £400. You may even be able to buy an empty shell new.
Light! They quote 15kg and it certainly seems light, and my outfitting is lighter than the original kayak outfitting was as well.
Easy to outfit! I just have a foam seat and thigh console and a lap strap in the existing seat holes. No complicated hull supporting structures or bow and stern walls to worry about. You may need to carve away some of the thigh braces -- just a wood saw and file does the trick.
No footbumps! Not many kayakers can fit in it, but of course this makes it perfect for C1. Later models have some rather ugly footbumps added on by Prijon, so try to get hold of one without them (either special order from the factory or get a used one).
If you want aerial action, then try the delirium, which is a shorter deli with more thigh room and slightly faster front surfing ability(but tricky to back surf, apparently).
/edwin