I have said many times, nothing is perfect. Both systems are good.
The profiles use known technology, it is good. It does have the problem
of all streight splines, it wears and requires a lot of mainanance. But
is solid.
The Koxx, ISIS. yes good new solid interface. Hub may be solid but due
to it's constuction causes spokes to break and has a narrow flange....
wheel stength against hub strength... guess it depends on riding
technique. Don't worry about grinding, loads of metal on those
cranks.
Interesting you are not comparing the Onza/KH, it gives you a stronger
wheel than the Profile and Koxx. Yes it is still streight spline and
hence has the problems of any staight spline. Although having said that
it does have the extracting locking ring fix, so in my opinium is
better.
Please remember all splined hubs require a lot of mainance! keep those
spines in good condition.
Roger
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