In my case I can out climb but have lower top speed than other RV7 aircraft I have flown with. This is in line with much of what I read on this forum as well.
We are taking a knot possibly two at low alt so the difference is rather small. I also just like the look of a 3 blade
If anything, the three items I would suggest you consider are:
1) I feel the 3 blade composite reduces vibration a bit over metal 2 blade
2) The light weight of the prop and modern starters shifts the CG weight back enough where you will hit aft CG limits before gross weight unless dealt with during the build.
3) It will be harder to remove the cowl for service