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choose one
UltraTorque. If you don't work in aerospace, it's probably the only way you'll get to play with a Hirth coupling, which is in itself a pure joy. The bearings press onto the expensive axle and slide in the cheap cups, which is the right way around and the opposite of HT2, GXP, MegaExo, BB30, PowerTorque etc. It hasn't been discontinued, so there's more chance of getting replacement BBs for longer.
OverTorque is just PowerTorque made even worse by having an aluminium axle, and nobody who is paying for their own cranks needs the small weight saving and marginal increase in stiffness enough to compensate for that.
gbj_tester
So if you had a straight choice between the two (and had to choose one)??? Cheers