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I just found out, that it's not just the plastic that makes for a diff. flight path. I just stick with the Champ. plastic, because of the shorter life with the DX, and Pro. Now the three diff. molds come into play. The San Marino (least stable), Ontario (slightly more stable), and the Rancho (most stable out of the bunch) Now out of all the plastics. They say the Pro is the most stable, but breaks in quicker. I throw a Champ (Rancho 175g) I find it to be more stable than the Buzz I had, and it was a first run. Which I understand is more stable than future Buzz's. I've hyzered a Roc into a fairly stiff head wind (10 to 15mph) and it didn't turn over. Can't say that about my Buzz.
P.S. I'm not bias to any disc co. If I like it I'll throw it!