A+T? Solitude? Never heard of these short lived servers? 0.0
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A&T was only just short-lived, bearing in mind that Solitude was barely open for a couple months and A&T was open for 7. I would have to say that A&T is my best guess, as it was one of the, if not the most popular premium server Blocktopia had, and in my books ranking second best in popularity after RoF! Reason being that even when it had a few weeks to a month deprived of players, it would have general boosts of 20-max players on a day and averaged a similar player count to RoF.
The only reason the server lost popularity was due to its infamous "I am going to crash every time someone opens a world because the same world is already open because when people leave they aren't closing their worlds" glitch, which got worse and worse until there was more bugs and it was a becoming a huge nuisance to keep open.
Solitude rarely raked in a decent player count, and after a *somewhat* large petition to bring it back, still lacked in players. Although it was exciting to play, and unique, I doubt this would be a choice.
And as for classic servers, they are being quite the nuisance from what I could see, and considering the classic server list is no longer displayed the only players the server would most likely see is us!
Sorry for the long reply, I just felt like it : (