My comments will be VERY general in nature. Also, I have not used tube equipment for a good while and I may not be entirely up to speed on SOTA tube equipment. With that said ... tube equipment can provide a greater degree of lushness, warmth, and liquidity to the overall sound than solid state equipment can. Solid state amps have their advantages ... they are typically more detailed sounding with less total harmonic distortion (.08% THD is common for solid state as opposed to 1% THD for tubes)and they run much cooler. Tube advocates will claim that the higher THD is of a pleasing nature and does not distract from the sound. And just as solid staters are modding their equipment, tubers are rolling/rotating tubes and debating the virtues of new old tubes (NOS) versus new tubes.
Tube equipment is typically way more expensive (hand wiring, etc.) than its solid state counterpart ... which is one of the reasons why the Jolida is so attractive ... an entry level way to enjoy tubes.
Hope this helps.
Regards, Rich