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I do not have a Micro or Bit (just a couple ZZs), so I may be talking out of my....well, anyway...
Everything I have read says that the Micros / Bits PCBs provide more voltage to the motor. Possibly as much as 2 times the voltage that ZZs get. There are pros and cons to this. Yes, the Micros and Bits go faster than the ZZs, but the battery life is significantly less.
I have also heard that the controllability of the Micros is such that their increased speed (and tendency to oversteer) make them more difficult to control on a twisty track.
Again, take this with a bit fat grain of salt...the Bit/Micro vs. ZZ is verging on a holy war for some people. To me it boils down to cost and function. I like the ZZ prices and look (more realistic, I think,) and like their performance.
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