both for different applications, though....
The tube amp main rig of a guitarist should be 50w-100w rms vacuum tube for the big, round warm clear and breathy tone----Marshall, Vox whatever....the sound reinforcement I like in the sound reproduction department stage can be a solid state amplification item like Mosfet Bluetube 500w rms....brutal, with transients and warm in a mosfet electronics kinda way to keep the guitar signal warm and not sleet-needle sterile.
In the hi-fi department it is tubes all the way....even if the amp only has them in the preamp section of the unit's circuit--like 6C10's or something similar. I will soon be changing over from a 70w-rms-per-side Mitsubishi M-VR600 A/V receiver solid state unit to a 60's-70's, 25w-rms-per-side Harmon Kardon A500 (4 x 7355; 4 x 12AX7; 1 x 12AU7 tube complement).....and I replace the receiver side with a simple Sangean HDT-1 HD AM/FM radio seperate ($120) and repair on my way to reconnecting the (2) 1975 Pioneer cassette decks and a 1973 Sony 1100 turntable and a freebie, 1992-ish 5-CD changer by Kenwood (lol...I would like a Carver, but that's next in the works---with a tube in it!) With tubes and my stilted hearing it's all in the 2,000k Hz to 5,000k Hz range-----and the tubes reproduce musical tones and stuff with the transients and upper-midrange/treble so beautifully.