Assuming high quality like those 2 makers, no difference would be my answer.
Good Tube stuff is designed to handle heat, so there isn’t a lifespan issue that I have experienced. My quality SS equipment has been very reliable, it can get hot also.
My reliability issues have been with the weakest link, usually a moving part, look for them: a speaker terminal or push button breaks, a jack panel loosens, ground connection screw strips, loosens some how.
When I buy cameras, it’s also the weakest link. I try to anticipate, avoid problems, a cheap plastic battery door, waiting for me to break it. If I buy cheap stuff, or good stuff with cheap parts, I treat it’s cheap moving parts more carefully,
If one had ceramic tube sockets, the other plastic tube sockets, that's a clue.
And, modern equipment, too much complexity, too much software, i.e. for some reasons, an HDMI jack stops working, a ...
