higher voltage with appropriate gearing and motor selection will give the optimum setup....only reason im running 4s on my NEU maxx is i am using a MM and 4s is already pushing it a bit.
quality differnece in $220 maxcraps (smc may be like maxamps..) and $180 neu packs with enerland 5000mah cells......
http://www.youtube.com/watch?v=fp94K0TGfTY