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from my experiences z is the most stable then i would say Cryztal esp, flx, x, buzzz ss and then d.
i think mark ellis told me cryztal is just z but theres somthing special they do to the plastic i don't remember.
These are the semantics that confuse new people to the sport that are trying to understand under, over, and just stable.
Overstable means turns hard to the left rhbh (Right hand back hand) or hard right rhfh (right hand forehand)
Understable means it can be flippy or if thrown rhbh it can turn right.
Stable, I guess really means nothing, to say a disc goes dead straight I will say straight flyer. When I say more stable I mean it just hyzers to the right a little harder at end of flight.
I was saying it turns a little more to the left then the others. However If I put anhyzer on them (releasing at an angle that would force it to go right) they all will go right. A buzzz is a very straight flyer and will hold whatever angle you put it on. What I like most about it is that I can throw it as hard as I can and it wont flip over and go to the right. When I throw my Roc I have to throw 70% power to keep it going straight.