Top 3 for me were Jellicle Ball, Sunset, and Dead Outlaw. Ragtime right up there too. Other highlights were Illinoise, Maybe Happy Ending and Suffs.
The massive caveats are that I haven't seen Oh, Mary or Carmelita Tropicana yet and I could easily see those being some of my favorites.
I'm with Isherwood that I would've been quite surprised to learn in January that Andrew Lloyd Webber would top my list, much less occupy two of my top three.