[suicideneil]

I think 99% of the time it depends on the layout of the vehicle, often there isnt enough room for the batteries to go on either side and the motor upfront/at the rear etc. Plus, most guys also run one large 4s lipo, rather than a pair of 2s lipos in series, so you cant split the weight with a lipo on either side...

I like the idea of a motor in the middle above the center diff, then a lipo on either side- even cleaner layout, but it requires more fabrication for a custom motor mount and trimmed braces etc.