Through the journey I've just learned that I don't like triode- at all- for metal. I want the full pentode punch. I've also learned that I'm not a Mark III guy, they sound like they have a blanket over them after coming from Mark IIs. Also, Simul or not, the Mk III Coli power sections are not as beefy as the MkII Coli power sections. The filtering is different but more importantly the II Coli power sections have 0 negative feedback.
For me personally in my 3 piece, I want huge amp girth that fills the room with unquestionable punch & clarity. With so many amps they sound killer at home, or even with the band in the garage, but when you play a big open space all the thickness of the tone just disappears. I remember the first time I gigged my Triple Recto I was like "what the fuck is happening here there's no balls in this room?!?!" The only two amps I've personally experienced that brought "fuck yeah" girth & tone to a big room were the MkII KRG and a SLO. The SLO wasn't metal enough for me, so the KRG it is. All other amps have been rehomed.
To be fair I never gigged the Wizard MTL, but (while it was huge) I thought the gain structure sucked so it didn't stick around that long.