Rampage 5 Extreme will fit in both case, you can google little.
All motherboards as Rampage 4 Extreme, Rampage 3 Extreme, Maximus 5 Extreme and similar if you see inside that mean fit.
I think it's better FT02 because in FT05 you will have little more problem to connect SATA cables.
But both of them are beautiful case.
How long will the X99 platform last you'd think?
Another 2-3 Years?