Rank up decision R5 Hype, R4 Proxima or R2 Cull

WHOz_R4GE

Right now I only have the cosmic T4CC to do one of the following:

R5 Hype (duped)
R4 Proxima (duped)
R2 Cull (unduped)

6.1 is 100%, so this will mainly be for 6.2.

Thanks