Tubes overload easily. Tubes sound nice in overload. They act like a compressor. They add lots of the right kinds of harmonic distortion during overload and this can make a pleasing sound. It can even make the music more audible to our ears/brain ( we are very susceptible to discerning harmonics)
Solid state can be more robust and play at much higher levels with better linearity = more accurate. However, when Solid State clips it sounds awful and immediately becomes much less accurate.
To get good sound with Solid State you need to absolutely ensure no clipping. (i.e. requires a very powerful amplifier and an easy load). A good linear tube amp will actually sound almost identical to solid state up until the point it clips (often this occurs at very modest levels due to transient peaks) at which point it gives that famous "tube sound".
Solid state can be more robust and play at much higher levels with better linearity = more accurate. However, when Solid State clips it sounds awful and immediately becomes much less accurate.
To get good sound with Solid State you need to absolutely ensure no clipping. (i.e. requires a very powerful amplifier and an easy load). A good linear tube amp will actually sound almost identical to solid state up until the point it clips (often this occurs at very modest levels due to transient peaks) at which point it gives that famous "tube sound".