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Andrew, I’ve owned both an IVO prop on a Rotax 503 and a Warp Drive 3 blade on a Rotax UL 80 hp in the past, both on Kolb aircraft.. In my opinion, the Warp Drive is a much better prop for the 912. Very tough, easy to adjust, and reasonably priced.
My buddy Kyle Woodfill hangars right next to me, he has a new 701 w/912 ULS spinning a 70” 3 blade taper tip stainless leading edge Warp Dirve prop. It works great.
Check the MMI of any prop before purchasing. Rotax specifies a min and max for the 912 and some props do not meet this requirement.