RR by itself can be pretty unreliable for crits on physical BPs, I pretty much always have RR/GH for better chance of critting whenever i'm using a physical setup, then either regen atma or stout arm as 3rd (no VV yet :<)
As for SS vs VV, it would probably depend on what you're fighting, since celestials like garuda are BLM, their natural STR isn't as high (they have a D rating in STR I believe), so STR atma would help dmg quite significantly on harder opponents, I'll have to test it at some point.
Leviathan.Niniann said:
All STR+ atma for single-hit phys bps like spinning dive.
Single hits like spinning dive can crit as well.