I cant compare the 2 as i have never driven a Stampede. As comparing it to a full size revo though, pretty much identical. A bit more tippy on fast cornering, but thats to be expected for a truck moving faster than a revo (stock 3.3 that is) and a much lighter weight. As far as durability, stands up to the Traxxas name, havent broken a thing.
Lot of folks have swapped out to higher weight shock oil (60 seems to be avg) and the tightest springs and others have went with some Ace Hardware springs. I have the links somewhere to what's needed.
I'm going to do both and swap out tires to the Revo tires on my slash VXL-sucks getting stuck in the grass.