If you get a Mamba Max and plan on using 3s LiPo, *don't* get the 7700, as it can't handle 3s. Get the 5700, which can, thus it has a wider tuning range. The 5700 on 3s can actually be made to go faster than the 7700 on 2s. And yes, you can tune a bunch of settings on the Mamba Max. The upcoming Tekin Redline motor w/ a Tekin R1 speedo looks like an interesting choice. The Mamba Max and Tekin are supposed to be able to handle sensored motors as well as sensorless motors. The Novak can only use sensored motors.
One advantage to the Associated TC4 is that you can get parts for it just about anywhere. The higher end touring cars have limited parts availability.