I vote 12S
I plan to run 2x 4S Lipo in my 1/8th scale and 1x 4S Lipo in my 1/10th scale
vehicles
A 100 amp esc is plenty for either scenerio above seeing how my avg amp draw varies between 35-45amps
One thing to keep in mind is the all mighty ROAR and other sanctioning bodies that currently limit MT's to 4S