The only time I carry all one type is when it's raining or really cold and I carry a full bag of Vibram discs. On sunny/dry days, I carry all different types.
I haven't gone with a single type of plastic, but I have ruled out Z and Champion for backhands. I have dry hands and just get inconsistent releases with them. Big Z seems to be ok for me, though. Most of my discs are either Star, Gold Line, ESP, Z-Flx or Ti.
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Putters are the only mold for which I've almost exclusively used base/pro plastics. I've never thought of my bag broken down by plastic type so I took shot:
9 Pro/DX (1 fairway, 3 mid, 5 putter)
8 Champ (5 fairway, 2 mid, 1 putter)
6 Star (3 driver, 3 fairway)
I'd prefer using molds that share pieces, different plastics can be chosen for a certain flight characteristics or conditions.