Been there done that with most brands on many different RV's. Currently we're flying an RV7 with an Aero Composites prop that is quite nice. In the past I've flown behind and/or used on our own planes the paddle blade hartzell, sensenich FP, Irlbeck FP, Hartzell blended, WW, Catto FP and MT. As it sits today, if we buy a new prop it'll be a standard B/A Hartzell.
It depends on a few things...if you have a TD, then a metal prop up front is really nice to have for CG reasons...if you have a Nosewheel, then the composites are nice. In the end as others have pointed it it's really hard to beat the standard ole' Hartzell all things being considered. I've come full circle on props and am back to that as probably being the best out there overall (like I said, taking everything into consideration like price, installation, maintenance, long term viability, utility, etc..).
I love the composite props because they are smooooth, but so are the Catto and other wood/composite FP props, and my experience has been that MT's have almost universally been slower on almost any RV installation I've seen, but WW's have been pretty good - though not always noticeably faster than a B/A Hartzell. This is not the case for every engine on every plane and every person, but just a general overall consensus for your typical 360 powered RV.
I do not have any experience with the Harntzell Composite props so I can't comment on them, but Rob Hickman does and can comment with a good deal of experience.
Just my 2 cents as usual.
Cheers,
Stein