I am not quite sure what you are saying - reaching top speed quicker means quicker acceleration. Better acceleration is achieved by reducing the size of the pinion gear, which will also reduce the overall top speed. The 23T superstock motors can be geared fairly high (big pinion) compared to say a 15T motor, at the same time they have the torque to give good acceleration even with that bigger pinion. Lower turn motors need to be geared lower (small pinion) as they have less torque than higher turn motors.
I bought a cheap 12T double motor for my Rustler once and although it revved at 42,000rpm I had to gear it so low to get the acceleration I needed, the top speed was no higher than the 23T superstock and the torque was not as good any way.