I am retired and build vacuum tube guitar amps as a hobby. To date I have built a 5F6A Bassman clone, a Trainwreck Express clone (played through a Marshall 1960a Lead cabinet loaded with G12M-65 Creambacks), and a 5F1 Champ/5F2A Princeton hybrid. I have also modified the Fender Champion 600 reissue to 5F1 spec and the Fender Blues Deluxe Reissue to closer to 5F6A spec. I now want to build a Marshall clone and am trying to decide between a JTM45 and Plexi. The amp will be played through a Crate 4x12 cab loaded with Celestion G12M-25 Greenbacks. So my question is, which of the two Marshall's I mentioned would sound different from, yet would compliment the amps I have already built? Note that i only build Weber kits and I make modifications to each to tweak them to my tastes. Also, i have a BSEE earned when vacuum tubes were still part of the curriculum. TIA.