My ‘67 Tremolo 50 is by far the best Marshall I’ve heard so far. It has such an organic, rich tone that it demands higher quality boosts. It’ll expose the cheaper/pedal-like sound of even what I thought were great boosts, so the only ones I use with it are my Klon or Coppersound Broadway. Otherwise best to just run it loud without a boost. Sounds also bigger than all my 100 watt amps except for my Gjika, Hiwatt and Blueface despite being just 50
My ‘79 JMP2203 is my next favorite and also killer when boosted with the klon. All the other Marshall’s that came out later were worse and not that worthwhile imo. Unfortunately most of these great amp brands peaked early and then went downhill (same with vox, fender, diezel, etc)
The DSL’s I guess can sound good for the price. The JVM’s have a nice voicing overall, but sound synthetic, basically like you’re hearing a recording of a really good Marshall and too compressed
The Cameron and Monomyth mods have been my favorite modded Marshall’s, but the 2 stock ones I’ve kept (‘67 tremolo 50 and ‘79 jmp2203) with my Klon boosting it imo sound better than any modded Marshall’s I’ve tried so far and I’ve even gotten to try one real Jose modded ‘79 JMP2203