Good point about the vocals. Since one of Harmonix games was the Karaoke Revolution series, they had a huge head start on the vocal quality, and essentially had the technology perfected before they even started on Guitar Hero. I was extremely disappointed with GHWT’s vocals, it was a shadow of Rock Band’s quality. Very sad.
The one thing RB doesn’t have that GHWT does, other than the pretty cool but critically undocumented music creator, is this neat feature – if you pause the game, when you unpause it GHWT gives you a countdown from 10 before the song continues, so that you can get your place and be ready. RB still doesn’t have this, but I’m sure it’ll come along in their next editions. It sure isn’t enough to make me want to buy GHWT.