I ride a 2012 Remedy 26 and a 2012 Niner RIP9. Without getting too technical:
Trek's Full Floater is designed to keep the wheel on the ground and tracking over bumps no matter if you are pedaling or braking. The flip side to this is that there is some suspension bob when you hammer the pedals. It also uses a custom shock to help give you really good small bump compliance and still have good control on big hits. It rides very supple and plush.
Niner's CVA is designed to firm up when you pedal and go back to being open when you're not. The torque from the chain effectively firms up the suspension which puts more power down vs bobbing. The chain torque also works the opposite way; when the suspension compression force is greater than your pedaling (or coasting), the chain will pull your pedals back a tad. In general CVA runs firmer.
Full Floater = supple, plush, good on big hits but bobs a tad.
CVA = firmer and more efficient, not as plush or smooth.