Ride both sets for 4-5000k then decide based on how often you're patching one or the other or lying on the ground after losing grip on a wet corner.
Probably don't have time to ride 8-10000km between now and august :(
I've ridden about that much on gp4000 25s and never came off (apart from once on black ice). Have you had issues with grip on the hypers?
No issues at all with Hypers so far (other than the 35s being a bit big for my bike). I've only had them a week though and half of that week I was drunk I've not done that much on them. I'll know more after a couple more weeks.
@gillies started
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Ride both sets for 4-5000k then decide based on how often you're patching one or the other or lying on the ground after losing grip on a wet corner.