The Whirlwind hands down. I enjoy TSOAD a lot, but I rarely revisit it or it's sequel (and would rather listen to TGE or I&D).
I just have a lot of memories and nostalgia for TW - keeping up with the rumors and updates from Neal and Mike, anticipating the arrival of the album, stumbling upon a sound-marked leak with voice overs in the middle of each track, and then endlessly spinning the main album throughout the remainder of 2009 after it released.
In terms of a highly anticipated album, TW ranks pretty high on my list. The band had been on a hiatus since 2003 and I never thought they'd ever return, so getting another Transatlantic album felt like a miracle to me. I've rewatched the making-of documentary at least a dozen times, and I enjoy it every time.
There's just a lot of love for TW and it's surrounding hype, both the build-up and release, that makes it very special for me. I just never got that for TSOAD, and that came out at a time where Neal had done many more long concept albums with Mike and Randy. It's good, yes, but only because it was expected to be good. I like the contributions from Bill and Eric as well, but there's just a certain magic with Neal, Mike, Roine, and Pete, who is a BEAST on TW, and the album VIP.
-Marc.