I've only played one once in a. Festival stage and it was pretty good through an 810. Spades of power and presence.
Everyone's posts above are bang on.....throw in the cost of a revalve and it's not cheap...
That said I still play through a matamp gt200. Not the most practical, heavy, way too loud at times, but I love playing it.
I had a Laney nexus (400w all valve) for a while. Awesome amp, but played too many gigs where it didn't really get going in the power section.
I bet the soundcity is pretty banging as amps go. If you're looking lighter I think the handbox might be at 100ish watts?..... Ashdown ctm100 is pretty light by valve standards.... Kinda depends on your rehearsal volume, cabs and tuning etc. ✌️