I prefer solid state because:
- there are no positron tubes to realize low distortion complementary designs;
- there are no tubes to blow and punch a killing signal through my speakers;
- low voltage is safer than high voltage, for people, pets, and downstream components;
- low voltage is cheaper to filter, so that $x buys you better regulated power;
- no tube-sourced hazards mean that I can remove protection devices or circuits, and considerably improve the sound thereby.
YMMV