Movie theaters use ss equipment because tubes would be a nightmare the tubes would always be sounding not like new and it would be nearly impossible to get the LF response needed to make spec. Sure there are tube amps that can put out a lot of power but the tubes are very expensive, unreliable, and degrade immediately after putting them in the slot they also are about 90% inefficient creating more heat than power.
My amps are the BHK 300s by PF Audio they make sense to me because the front end is tubes and the power side is mosfet, gives you the best of both. Guitar amps are always tubes they need the ring, warmth and distortion characteristics that tubes can bring, but now guitar amps can be ss and simply be programed to emulate other tube amps, the best of these emulators can fool anyone.