First off, I've been super impressed with how much of an improvement the JL, JLU & JT are over the JK... the Jeep engineers took the best parts of the JK, tweaked them and ended up with a much more refined vehicle. Not sure if you've spent much seat time in a JK, but the JT & JL are so much better.
Next, the JT & JLU are pretty much identical from the back seats, forward. One is a SUV, while the other is a truck. It's pretty easy to decide which one suits your needs based on that alone. IMO the JT drives better on the freeway due to the longer wheelbase than the JLU, but that same wheelbase can effect it's capability on challenging trails.
One thing worth mentioning, depending on how you want to use the Jeep.... the Gladiator with the Max Tow package is rated to tow up to 7,650#'s and the cargo capacity is pretty high too at 1,700#'s. That said, this is still a Wrangler-based truck and while it's capable of hauling that much weight, it is not a 3/4 ton truck! You're working it pretty hard to tow any more than a few thousand pounds IMO.
Obviously the Gladiator has a bed, but it's pretty short and fills up quickly. There is more cargo room with the JT versus the JLU, but it's exposed to the elements. The JL has 3 engine options,
the 2.0T, the 3.6 Pentastar and the 3.0 EcoDiesel. The JT has 2 options, the 3.6 Pentastar and the 3.0 EcoDiesel. If you
choose the automatic transmission, it's the ZF 8HP 8 speed, which is AMAZING, IMO.
Plenty of info in my Gladiator thread... -
https://www.rme4x4.com/threads/the-rme4x4-jeep-gladiator-rubicon.116261/
What else do you want to know? IMO the best thing you can do is to go test drive both options, you'll figure out pretty quick which one suits you.