I'd definitely put GoT and SW as tops for modes. Dwight is the man for sure.
Here's another underrated one for you though...Mustang. The modes on that game are awesome...each has a very distinct feel and they use the entire playfield in creative ways. Rally Race is a standout. The callouts shout at you to make turns, and they correspond to the left or right side of the playfield. So when it says make a right, it will be a shot on the right. Sometimes it's even a gentle turn vs sharp turn with the shot being further left/right. Then there are shortcuts, which will time out quickly. You can also miss a turn after awhile, and the callouts will tell you while changing the lit shot. It's really a great mode and really sucks you in to the race. Each mode is distinct and creative like that. And that's not to mention the Upgrade system, and the many different and unique multiballs (including the crazy risk/reward of trying for 6th Gear!). It is a fantastic coded machine that doesn't get nearly enough recognition.