The Erevo is much more durable than the EMaxx- only thing that lets it down really are the diffs; the maxx has weak:
Bulks
Diffs
Towers
Chassis
A-arms
The Emaxx is more of an MT, but the Erevo is still an MT too, but a more capable basher and racer at the same time.
$1200 is a ripoff though, you'd be better off looking for a tricked-out Emaxx roller on ebay & just dropping an MMM system into it with a couple good 2s lipos.