One thing I do know is the vega seems to be fit and forget
As far as I know only the rear shock tower has failed in a massive shunt on someones
No chewed gears or failed Ali bits (bends etc)
Certainly no snapped chassis's etc
No upgrades required . Everything in the vega box you require! and to fit the new b4.1 also the old imperial b4 (different conversions)both vega.
I don't know about the x6 so can't comment
What I do know also is
I'd rather have a slim ugly one
Than a fat ugly one lol (joke)
Cheers