GB sucks. Don't listen to the bull crap hype, listen to "Who brought the dog" over and over. The linear rule set just doesn't match the game.
So that leaves two GREAT choices. TWD and AC/DC. No matter which you pick, you win. They are both a blast.
TWD is an awesome game. It's fun, and can be a bitch. The rules are fantastic, with plenty of adventure along the way. The modes are great, and the sub wizard modes are great. All around a wonderful game.
AC/DC is among Stern's best games IF you like rules in games. TWD is more of a quest game, but AC/DC is a score based game. And getting that score is stunningly well done. There are tons of ways to approach it. the levels of complexity are amazing. Lyman went nuts with it.
Now, AC/DC does have one downside. Players get locked into a strategy they like and only play that way. Because they stop trying other things, they limit how they play, and the game can get boring like that. They play every game like it is a tourney. Same song, same exact shot order, boring. It's easy to avoid if you are aware of it. Just play the first song the game gives you and work on your strategy for that game.
In a one game collection I'd pick AC/DC hands down.