Howdy Brandon,
I had the opportunity to test fly a 2 blade Catto and a 3 blade Catto back to back on the same airplane.
Back in 2014-2017 I tested propellors for Craig on side by side RV aircraft--used my IO360 powered RV9a as the test bed. Lost count as to the number of props on that plane but on one occasion, out of my own curiosity, I tested my personal 3rd gen 3 blade 74.5 inch pitch Catto against a buddy's 3rd gen 2 blade 74.5 inch pitch Catto. Got some base line info on day 1 with the 3 blade then switched to the 2 blade in the afternoon and tested it on the same card as the 3 blade on day 2.The 3 blade was smoother and noticeably quieter as well given the shorter blades and slower prop tip speeds. I used a phone app to check aircraft vibration in flight to confirm the difference in perceived smoothness.
Ref performance, as expected the 3 blade got off the runway quicker, climbed slightly better, but was 1.5 to 2 knots slower in cruise.
I would have to say both props were smooth but the nod went to the 3 blade.
Craig has since gone to newer generational designs and I do not know if my results still hold but I would say you really can't go wrong with a Catto Propellor--and they are so **** pretty!!!
Hope this helps,
Cheers,
db