RE: Traxxas stampede 4x4 vxl or HPI Savage 2350?
I would say probably more durable than the maxx, but about the same or less than the e revo.
If you stick to a stock setup on the revo and the pede, both will be very durable and lots of fun on 4s (revo) and 2s (pede) LiPos.
When you step it up to 6s and 3s, both trucks will have issues until you mod them a little bit. But then again, so will the Savage. 6s bashing is hard on any truck, no matter who makes it.