The more powerful the motor the more amps it takes basically. Your best bet is to go with the highest amp speed controller you can afford as then it will support more motors when you come to upgrade to a faster motor.
HTH
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Team Associated B44FT ~ LRP SXX TC Spec ~ LRP Vector X12 6.5t ~ Savox SC-1251MG ~ Spektrum DX3S
Schumacher Cougar SV Pro ~ LRP Sphere TC Spec ~ Losi Xcelorin 6.5t ~ Savox SC-1257 ~ Spektrum SR3100 ~ Spektrum DX3S
In progress: Team Durango DEX410 V1-V4 hybrid ~ DESC410V2 ~ DEX210
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