I throw both, plus some Latitude 64 (by the way, the best plastic out there today!). I could not imagine only throwing one brand, unless I got paid to do it. As for plastic. I think the old CE plastic is as good as it gets! but in todays form. You can't beat Latitude 64. Now thanks to Dave D. at Innova. I carry a mix of plastic. For the most part, my high speed discs (7 and up) it's Star or ESP. Low speed stuff it's Champ or Z, witha few exceptions mixed in.
Come on,how could you pass up a Firebird, Sidewinder, Leopard, or a Teebird. Same goes for the Buzzz,Wasp, or Hawk. I couldn't imagine nto having any of these in my bag.
Gateway is what I used the most of but I also throw Innova, Discraft some Quest AT... I guess for me it's more about the disc then who makes the disc, to be limited by a brand name could make you miss out on the disc that might work best for you. I have known many who throw one brand, and wont even try your disc if it's not that brand! Good Quest though, I hope you find the info here to help you fined that one perfect disc!
I'm a little Vibram fanboy. The putters have helped my form immensely and the Summit is my go to putter now. I'd like to get a firm summit, maybe soon. But I tested out the Ascent and it was wicked sweet, just like a teebird. Innova is all that is really around me so I don't often have a chance to throw discraft. I've almost bought some at events but for some reason I just haven't. I would like to snag a Buzz and Pred but no go yet. Nothing from Gateway or QuestAT interests me but I wouldn't mind trying out some Discmania or Lat 64.
In the long run though, I see my bag being all Vibram, I really like their approach to making discs and selecting the molds they want to make.