I generally prefer star to the other plastics, all things considered, but it really depends on the mold. Seems like certain discs are just "better" in terms of consistent flight etc. in one plastic and not the others.
I like the wide-rimmed drivers in Star, I mean how can you not like to pull a "Star Destroyer" out of the bag (cue Darth Vader theme.) I like those drivers to wear in, season, but not too fast, like DX fast. Star drivers will season in and add glide, whereas Champ drivers are less glidey for me in general, and seem to never get glidey. So, I love my Champ Rhyno for those shots (approaches,) because it never glides, ever, and is perfect for when blowing by the basket is unthinkable (actually, I also have a beat up Star Rhyno, the oldest disc I've got.) Ditto my flatflat Firebird, since the shots I use it for are the most abusive, and require it to stay mad overstable.
Most of my mids are champ (or equivalent). They take the biggest beating in my bag, and I like them to retain the flight characteristics longer...but all of them, including a new RC3, are much more 'candy' or 'gummy' than what I think of as "traditional" champ.
Star's not great when wet, but I think better than champ. I find the champ discs are tough to keep dry, especially the non-gummy, middle generation champ. It's like the water just smears on the surface.
Not a fan of Pro plastic, except for an R-pro and Yeti-pro Aviar that I use for all my 'throw-putter' duties. I like the tacky feel of pro, but it wears off almost immediately, and the drivers always feel like they're coming apart in my hand or something.
