The only real difference between tube and solid state is how it distorts, and you, as a guitar player, probably know that better than most people. Solid state amps distort in odd order harmonics, which sounds more harsh; tube amps distort in even order harmonics, which is more pleasing to the ear. Each is chosen for their unique sound, based on the type of music you're playing.
In the audiophile world, solid state has far surpassed tubes in all regards - power output, speed/attack, able to drive very complex loads, etc. The trick is having enough power (think 10x what you're actually using), and NOT letting it distort.