The internal layout is largely identical and they should both cool the main components identically, but the main differences would be
RV02:
8 expansion slots
Slightly longer/deeper case
Fits 3x3.5"
Aesthetically a bit more 'gamer' and plastic, has four feet so fans will be exposed to whatever surface is underneath.
Cheaper
FT02:
7 expansion slots
Fits 5x3.5"
Aesthetics are a bit more 'grown up' for me, aluminium unibody frame, fans aren't facing floor due to frame running the entire length of the bottom
Has sound dampening
I'm going for the FT02 personally because of the looks and the fact it's already pushing my depth limit for the desk, the RV02 is too long! It's also supposed to be a bit quieter once you've bunged all your components in.
Btw anyone see that Albino RV02 and how they've made the RV03 look much less awful than the prototype?