I have a quiver of RAMs and I really like them. They have that fast, smooth and slippery feel with great balance. Much better than my previous 07 Daytona's which always seem to rig very deeply and feel like a 'power' sail not a race sail.
Obviously the trade off between the V8 and the RAM is ...
RAM = race sail essentially
V8 = low-end power sail
I would estimate the difference in planing ability to be about 0.5 to 1 knt. The RAM would have the benefit of stability & speed & light feel.
In terms of ease of use and the light feel .... the 9.0 RAM feels comparable to about a 7.5m Daytona (not in planing ability just the physical feeling).