Voted TRON even though it's not a favorite or even a must do because so short. But at least it is a thrill ride. Test Track inside is just a jerky dark ride then outside is no different than riding in my own car. DS loves it - otherwise I'd be inclined to skip it.
Tron for sure. Haven't been on Test Track 3.0 yet but was never a fan of it as to me it's no different than being in a normal car. Tron is different and a lot more fun.
I've done both rides, Test Track just the other day, and neither are really my cup of tea. I did Tron in Shanghai and was ready for the ride to be over right after the launch. Clearly I'm not a rollercoaster fan.
I've been on the latest version of TT a couple of times now and once you get over the "oh yes, I remember this sequence from the old one" its basically a jerky ride with the exception of the fast loop around the building. Which ends with a series of abrupt jerks as the braking system kicks in to maintain spacing.
TOUGH choice! Love them both, but if I could only do one it would be Tron. That look, speed and feel of the ride set it over the top. TT is a classic though, and I really like the new version, especially the launch room (if you know, you know)