[InFlight]

There might be a slight difference in the stated amp*hrs of the various batteries that are approved (All are around 17 amp* hrs). The white Andy Mark ones are universally popular, and they often have free shipping to some selected FRC events where they have a booth.

Battery's are heavy, so the shipping cost can be substantial. See which legal ones have the lowest combined purchase & shipping cost to your location. There really aren't any huge performance advantages between the legal batteries.