Generally, I prefer a GA section on the floor. I like getting close to the stage and feeling the energy of the crowd. Yeah, you have to deal with inconsiderate idiots, drunks, and other nuisances. But I still feel like the overall concert experience is usually better. At a prog show, whether it's DT, Neal Morse, Transatlantic, or whatever, it IS kinda nice to be able to just sit quietly and take in all the intricacies of what is going on, kind of like a enjoying a symphony or something. So there is that side too. But I still generally prefer GA.
Anyhow, I've been to plenty of gigs that were seated and plenty that were not. Preferences aside, neither really ruins a show. It can be great either way. Interestingly, when I went to see DT on the TA tour, it was seated and everyone stayed seated. (the second show did have a separate standing section that a few of us made our way to) For the show the other night, it was seated, but once the band came out, everyone stood, and I was glad they did.