The strongest I had was Tibia. I cracked two pairs, but with both I managed to pedal back home, they didnt snapped clean off. Just cracked but were still attached to pedal spindle. They never bent which is a big plus. And in the same period I would bend/snap few pairs of other mor egeneric cranks. (Im cracking usually dozens of crank pairs a year). I highly recommend them. But nothing is indestructable.
Currently Im on Thunderbolts, so far so good. Plus warranty makes them probably the best choice.
I will try Maverics for fun too, as I bent badly three pairs of Powerbites back in the days.