Solp_online, I happen to own a pair of 20 W 845 triode monoblocks and a pair of 16W paralell single-ended KT88 amps, both made by Hyperion Sound Design.
I have also owned several push-pull triode, ultralinear and tetrode KT88 amps, by Quad, McIntosh and ARC, from 15W per channel to 90 W/ch.
My speaker's impedance is 8 ohms and their efficiency is 90 db/Watt. I can listen at loud levels with the 845 amplifier, though occasionaly, on very demanding music, I hear slight distortion.
Anyway,the Hyperion 845 amp is by far my preferred amplifier, it has magic, presence and emotion in spades, besides a very warm (lifelike, not Hi-FI), powerful and liquid sound.
IME, no push-pull amplifier I owned had such magic midrange and treble "air" nor presented the human voice so life-like, though push-pull amps have more power and tighter bass.
If your room is very large and you listen at high levels, go for the PP amps.
If your room is mid-size and you do not play at extremely loud levels, I believe you will be in heaven with a well-executed 845 amplifier.
People say that once you have tried tubes, there is no going back to solid state. I would like to add that if you love music (not Hi-Fi), once you have tried triode single-ended amps, there's no going back to push-pull amps.
Good luck on your search