7XL Vs 8L on 12 cells..which is better?

[Rtsbasic]

Hold on a sec, because this is confusing me. The 7XL draws less amps, thus less heat, but it will produce more power overall, and with correct gearing will result in a higher top speed than the 8L? That doesn't add up, because on only 12 cells the only way to get a lot of speed is through pulling a lot of amps..correct? So presumably if I geared an 8L to hit 40mph, and geared a 7XL to hit the same speed (via steeper gearing), they would both need to draw the same power to get to that speed? Would the 7XL get there faster because its bigger rotor = more torque?