To add some context, when I did my first degree, which was in Electronics, in 1968-71 we did courses in valve technology and circuit design and transistor technology and circuit design and everybody on the course was building their own amps (and all kinds of other gadgets). And guess what! Some people thought valve amps sounded better and some thought transistor amps sounded better. So the debate has been running for over 40 years and from what I read it is no closer to being resolved now than it was then.
In principle valve amps could be very simple in design. The old "record players" of that era, which everybody owned, usually had two valves and one of those was the rectifier and the amp was normally some triode valve and there was one capacitor and one resistor. You could build one in 1/2 hour and my uncle and I could repair them in short order (my uncle had a "record shop" and we did repairs on the side). The simpler the circuit and the fewer the number of components the less the circuit will add/subtract to/from the signal being amplified so in that sense valve amps should be "purer". Of course there are downsides to valves, they tend to get very hot and they are inherently microphonic, ie sound vibrations will be picked up by the valves and will modify their performance. Good design is needed to minimise these issues.
So as others have said you need to listen and decide what you think sounds best and if you find you prefer valve amps whether you can live with the practical issues (and of course whether you can afford them).
Chris