I hate the question of which tire.. Every rider seems to have a different style (= need) and a different opinion on like style needs.
The stock tires, like any stock tire, is a compromise the manufacturer has to make to abide by safety, mileage, performance etc.. So the stock Ax is not even a consideration for me.
I went with the Metzeler M1's for two rears, and one front. He!! I thought they were the CATs azz, I was getting down to almost beading the edge of the tire, chasing around my buddies on their 600's. Then they started swapping to the PP, and walking away from me again. Now half of them are running P2ct's after I mentioned the tire to them. So, since I am powder coating my wheels, had to knock out bearings, valves stems and tires, I ordered a set of P2CT's for meself, hopefully I will be closing the gap on these little bastages again.
Mileage wise, the M1's didn't work to well. Averaged 4,000 on the dot per rear. I do ride aggressive, practice drag strip launching here n there, but no burn-outs. And I run a lot of wheelie practice time, no clutch-ups, just straight throttle. Some rolling burn-outs to "clean" the tire before some twisties also. I basically beat the crap out of my tires so I'm not worried when I see tread wear bars at 3,000miles.