The discs that I actually throw are mostly DX. BUT... you can't dye DX plastic (very well or for very long before it fades anyway) so I've been buying other plastics lately for dyeing and have started throwing them too.
I like my Innova Champion Valkyrie (once I learned to keep it nose down). It'll fly a nice, late hyzer and my beat DX Valk is either a laser beam or a gentle arc depending on my throw (the DX Valk landed me my first and only ace so far).
My Roc is Innova's KC Pro plastic. It's grippy like DX but feels more durable. I've hit plenty of trees with it but only have one small chunk missing out of it.
I don't have any Star plastic but I have an S-Line Discmania GM Gremlin and I love, love, love the way it feels in my hand and flies. (And I've read that it's the same as Innova's Star)
I have a Discraft Stalker in Elite-Z plastic. It's super smooth, feels great and flies like a longer Shark.
Discraft's APX putter is pure money for me and most of that, I feel, is the plastic. It's Soft Elite-X and really has great grip/release from my hand when I throw. I've never thrown it and thought, why did it go there and not where I threw it.
I just got a Latitude 64 River in Opto plastic. It gets a little slippery in wet grass or on sweaty hands but when it's dry it really pops out of my hand when I get my grip right.
I really like my Gateway Element, but not the plastic that I bought it in. It's "sure grip" plastic (Gateway S Series) which gets a giant gash in it if it flies within ten feet of a tree! It flies a perfect line every time, but feels like a saw blade in my hand and looks like a dog's chew toy. But it has a pretty rainbow hotstamp if that helps anything...
Quest AT (Inferno) and Gateway (Assassin) both have Evolution Pro-Line and I have mixed feelings about them both. Solid, firm discs that fly well and last a long time, BUT they start to peel... I think the plastic might be breaking down in them.
So I guess I like softer grippier plastics (DX) but lately have venturing off into candy plastics (Champ, Opto, Elite-Z) thanks to the disc dying hobby. Maybe I'll start looking at S-Line and Star plastics more.