I can only guess that the turning circle would be tighter in 2WD and maybe it would use less battery, incidentally in this pic you can see the home made battery i am using with this truck as it seems just perfect its a Li-Ion 26650 size 2S 4200mah i have a pair of these i made a while back, you can take them down lower than a lipo and so get longer run time out of them plus its less weight than a lipo