whats the better motor combo

[OneKiwi]

I have:

LRP vector x11 7.5T and a LRP SPHERE Competition TC-Spec
and a
Losi Xcelorin S 6.5T combo

what do you think is the best combo to run in the xxx cr?

Would they work well in a 4WD buggy as Im looking at driving both classes

Should I post this in the electrics thread??