Best Sounding Amp? Hands down, bone stock (except for a 12AX7 in V1, instead of a 12AY7) 5E3 Tweed Deluxe! Let me qualify that though.
A) It needs a little "goose in the caboose" at the input (like most Fender circuits), when you want to get into the gainier territory of what a Marshall can do, but then it does it gloriously! When not goosed, it does everything else in the universe!
B) It has no reverb or loop for adding anything into the signal path, but "tell you what" it's so touch sensitive and tactile and gives amazing clarity throughout the tonal range, without ever being too clean!
C) It makes a fabulous dry platform for wet/dry rig, where you are driving the wet part of the rig from from a speaker out derived signal, as with a RedBox, or such. Absolutely fantastic as a core tone/sound.
Yeah, best amp I've ever played, but is lacking some of the modern features that we all love! With that being said, if I had some young buck to haul my crap around, set it up and deal with it, Id use a wet/dry rig with the 5E3 as the core, or with a dedicated, on retainer sound engineer to know and do all my effects cues, I'd play nothing but a 5E3, a low wattage, 5E4 Tweed Super, or a 5E5 Tweed Pro.
I mostly play Marshalls, but the Tweed Deluxe will have to be pried from my dead hands!
You Asked!
Gene
Marshall or other, owned it tested it or borrowed it ..... go.
The 2nd most un versatile amp I own but probably favourite, my 1977 JMP "2203" (I think it started life as a combo) I have not played a lot of different amps so my array is limited. I also had a JCM800 4104 from around 1982 that I remember sounded great. Foolishly sold many years ago, wish I still had it.
Here is the 1977 JMP. Guitar, cable, high input, V30 cab. Really want a green back cab for this.