Tube vs solid state (with all apologies)


So… I’ve been building guitar amps for a few years… and very familiar with tubes and circuitry…  and just entering the audiophile world. 
Is there a definitive opinion or discussion somewhere for help in determining where and or when to apply either?
smolder
Obvious that you're new here. There are more discussions on this subject than any other. Do some research on the forums. Just know that you'll come out of it more confused than you already may be.
All told, I guess I'm just a tube guy. I loved my genuine Pre-CBS Vibrolux dearly. With my Custom Shop "Pre-CBS" Fender Telly plugged into it, it gave me the finest twang in existence. It made my Les Paul roar. I sold the Vibrolux to a buddy who was more into playing than I was and replaced it with a tubed Carr Rambler, an amp that gives me a bit more flexibility than the Vibrolux did, but which still has 90% of the Vibrolux's tone. On the stereo side there were the Quicksilver Mono Amps, and now the PrimaLuna. It's not that I don't like trannies, it's just that I like what I got and I'm just not into shuffling stuff around any more.
I once used an in for repair long time loaner VOX AC30 as the amp and speaker combo for my turntable with a Linn solid state RIAA amp. That rocked! 
There are pros and cons with each, and each situation is different, so there are no absolutes here. Obviously guitar amps and hifi amps are completely different animals with different objectives (a fact that should not to be overlooked), but for hifi use I just have not been able to replicate the sound I like with SS, so I go with tubes, and likely always will.

Not sure I’d be as picky about the sound of a guitar amp, but it’s understandable that folks who play want a certain sound. Always best to just go with what you like.
Smolder, tubes are a PITA. There is some variability between tubes and performance may not be consistent. Some people love playing with their equipment and like seeing things glow. Others do not want to be hassled. Tube rolling is an expensive way of driving yourself crazy. There is some excellent tube gear out there. There is tube gear that sounds very solid stateish, There is solid state gear that sounds very tubeish. The difference in sonics is not near as dramatic as with instrument amplifiers where the amp is really part of the instrument.