Hmm I have both the dual and distx, and the dual is mostly the overdrive and dist combined.

I'd say in your case the distx would do the trick better, as the gain on both does get pretty high but just a little more on the distx (duh..)

BUT. I think the dual sounds way better, It sounds much tighter, and really punchy, more than the distx.

So if you want really high gain, and might go scooped mids and stuff (You can get kinda the Kill 'em all (whiplash) sound out of it, and Ride the lightning) go Distx.

Anything else would probably better with the Dual or normal Dist.

The midboost stuff and with pretty much gain is really eargasming with my Dual.

But both have pretty much indeed what the MT has not, body and stuff.