Since I owned both back to back I will add my two cents.
I personally would do the trade. I agree that the Savage 120 does sound a bit processed but I don't agree that it doesn't sit well in the mix. I used mine in a band setting with my brother who has a 6505+ and the Savage cut right through. There are a ton of tone options and it's not that hard to dial in. Clean channel is nice and the crunch channel is underrated in my opinion. I wish I had that amp back to be honest. I didn't realize how something worked and got frustrated and dumped it.
I should mention that I have owned four Engl's (E530, Powerball, Fireball 100, and Savage) and I owned four Mesa's (Dual, Triple, Mark IV and Mark V) and out of those amps I would take any of the Engl's over the Mesa's EXCEPT MAYBE an older two channel Dual Rectifier because I literally played one last night and it tracked very well.