I really like Two for the Show, but I can't put it on the same level as Yessongs or Welcome Back, for one really nitpicky reason: They've edited the songs. I'm not talking about editing the recordings post-production; the band themselves have shortened the songs and made some editing choices that really bug me. "Song for America" is one my favorite Kansas songs, but they skip the musical break which describes the industrialization of America and just jump to the last verse. Opening the concert by playing most of the song doesn't really get me started on the right foot. "Carry On Wayward Son" -- another fave -- cuts out the awesome a capella intro, which is an important part of the song. And so on.
What they play, they play well. But I'd still want to hear the entire song. It's bad enough when studio versions are cut, but when the band themselves can't even be bothered to play their own songs, that's really bad. Yessongs and Welcome Back, in contrast, give us expanded versions of the songs. That's what live albums are all about.