Ballistic rotor choices

Hello, I have been planning on upgrading my 10th scale motors for a little while and basically decided to "build a ballistic" motor for each. I am currently running a 17.5 in a T4, and 5.5 and 5.5L in a B44.

I was probably going to get the same turn motors, maybe just a 5.5L stator, but I'm not sure on what the advantages and dis - advantages are of the different rotors. So 12.3mm is standard, but I can get a 13mm, and a 14mm, and then theres some 12.3 that's stronger?

I race off - road on a variety of surfaces from high grip to very little grip.

What are the advantages to a bigger rotor?

Is there a dis - advantage?


Thanks for the help guys.