Novak 4.5 or MM & Fiegao 8XL in G3R w/ (2) 2s2p for 4s

[Gee]

I'm building an E-Revo on the G3R chassis with a single speed E-Maxx tranny. I currently have Maxamps (2) 2s2p 6000's and TrueRc's (2) 2s2p 6400's. So I could connect 2 of then in (series?) for 16.8v which I think is below the newer mm voltage limit. I read somewhere it was around 18v.

I have a Novak HV4.5 setup on my ext flm e-maxx now and like how easy it is to put in. Runs great when it is geared correctly. I have the MM7700's in my Rustly and Pede. So that is my experince with brushless.

I have another HV 4.5 (soon as the ESC is returned by Novak) that I was going to use in the G3R. I also have an extra MM ESC (soon as it returned from CC) and thought about getting an Fiegao 7xl or 8xl.

I know there are better setups (MGM, Neu, etc) but this is what I am working with. What would be the pros or cons of these two setups in the G3R with 4s4p lipos? Which one would you go with and why?

Thanks everyone!