Solid state ones are they will never be as good.
You probably aren't keeping up with amp tech. There's some brilliant solid state amps out there. The biggest trend is currently 'modeling', which is done in a few different ways. Basically, they sample real amps and then recreate the tone electronically. Even among experts, the results are indistinguishable from the real thing.
This is also great, as you can have one amp that sounds like classic amps, amps you'd never be able to find and buy (or really expensive amps) on your own. Look into Kemper and Fractal, if you're curious. They do something called "IR" (Impulse Response) to model existing amps.
The time has come where SS is as good as tubes, often at a lower price. For a couple thousand dollars, you can have models of any amps that have already been modeled. There's a community that buys, sells, trades, and gives away their models, so more and more of those awesome amps can be recreated both live and in the studio.
That's why I need to eventually bite the bullet and suck on the Microsoft teat, 'cause there's very little compatibility with Linux at this time. I'm currently stuck doing everything the hard way, on the device itself, when I should be able to just plug it in and have thousands of potential combinations immediately to hand.
Well, to be fair, solid state amps don't have the volume at the same wattage. A 30w tube amp is going to be as loud as a 50w ss amp. But, these days, fewer and fewer people even bother bringing amps to the stage. They're using in ear monitors and everything is digital. Sometimes, even the drummer is digital - but that leaves a lot to be desired (I think). They call it 'silent stage'. You just pipe your digital signals to the house's PA system and call it a day.
That said...
I still love my tube amps. I've got a reasonable (I think) collection and I use the best tool for the job, and that's sometimes still analog. There's something about a tube amp cranked to 10 and with your gain bringing it right to the point of break up. But, more and more often, I reach for a solid state amp...
Also, solid state amps don't weight 80 to 120 pounds! I'm too old to go lugging that stuff around!