Gotta go with Comfortably Numb on this one, with Time running a very close second. Odd to see it garner so few votes. I couldn't possibly nail down which version of the CN 2nd solo I love the most, although the PULSE version is considered the penultimate. David himself says that the solo he did in New Orleans on that same tour is the best he's ever done, and I've heard it.....he might be right.
Definitely Time. It was the first guitar solo of theirs that really got my attention. It's incredibly emotional, at the same time as being mellow. To be honest, though, without the "oohs" and the "ahs", it wouldn't have had much as an impact of me. Those complete the solo.
CN is #1 but Echoes (live in Gdansk) is my #2 for sure. Their just mystifying and emotional!!! You know that feeling like everything is ok and the high you get, the tingling on the hairs on the back of your neck.