Jim,
As far as performance is concerned, the moisture cure urethanes of which POR is one, work well for their designed purpose. ZR does also.
From there on, it's things like price, ease of use, safety, shelf life, UV stability, recoatability, aerosol availability that put smiles on the kissers of the ZR users. It really comes down to personal preference. There are loyal users on both sides and it will always be thus.
I see no reason why you could not load up say the last coat of ZR with some sand for the ol' non-skid.
Craig,
The gloss can be brought up in 2 ways, going to a slower thinner (if using bulk) and or a heavier film film. Be careful on the film build as it can really slow down cure if applied too thick. But then, the Oleum folks need their wheels of commerce turned too........
