I have not gotten a chance to ride Tron yet, but based on my experience with Mummy and videos of Tron I'd vote for Mummy. Tron looks like lots of fun, but Mummy just seems better themed. The Tron queue seems to be very similar to Space Mountain and mostly bland hallways. It's launch looks great and the interior portion seems fun with some good effects but it is so short. Whereas Mummy has a great thematic queue, the dark ride portion to start the ride off, a great launch as well, and the fake ending. Based on videos (depending on the speed) I do feel Tron has the better fast paced twisting section as the Mummy's spirits aren't bad but nothing special. But Mummy is still amazing and everything else around it is better than Tron, including duration.