1. mugen parts will be available for a long time
2. mugen is much more reliable - never broke a single mugen part (except once when I was hit by WOT truggy but that was not standard situation and other trucks would end up as pile of rubble)
3. mugen is lighter
4. mugen handles better
5. mugen has better aftermarket support
my finished mugen has RCM motor mount and battery tray and of course slipperential.
with 1mm offset mugen buggy hexes handles like a dream.
the body is metalic white, just a phone camera and too much light :)

3500g RTR without wheels 4390g wih AKA cityblocks