My experience is very limited, I never heard a JCM live. No amps where I am at, I just bought an SLO blindly back then. People that tried both Synergy and amp itself, say Synergy module gives a good impression of what it is.
Van Halen and Motley Crue are kinda built in in an SLO. To get it to...
Seems you leaning towards some heavier tones yourself.
Marshall is always a win I think. SLO I won’t comment as I have one and so I am biased.
Out of new stuff our people here are liking the new 2C+ Reissue it seems.
What you play, what you listen to?