Shouldn't this be Ripple vs Ethereum? Ethereum has a stronger development team and wider scope than Ripple. Bitcoin isn't even designed to do the same thing.
This assessment is based on what exactly?
Anyways, I agree: Ethereum, eMunie, NXT, Mastercoin, Colored Coins etc. are the things you should compare to Ripple, Bitcoin is just something that is very well designed to be traded on these platforms.
Centralized platforms remind me of Liberty Reserve.