IME, the restorative properties are similar to PB's TR, UTTGP is much longer lasting and doesn't wash off or run in the rain. I used it on my tonneau cover a few weeks ago, buffed off the sheen to a matte finish after a few hours and it's unfazed after 4 washes. 303 would be gone after 1 wash, TR after a few washes. The TR left black streaks down the sides of my white truck after a day in the rain.
Gave the Ultima a try on the tires after pleasing results elsewhere. It appears about the same as the matte finish after buffing down an application of Stoner's More Shine, lasts about the same as well. As an aerosol is a lot easier application, especially with raised WOL tires I'll be sticking with the spray there.
UTTGP restores as well as Black WOW and is easier to use, beads like 845, doesn't run and appears thus far to have longevity better than anything else I've used. It'll be replacing most of the exterior dressings and protectants in my cabinet.
Great review by the OP... got me off my duff to add the observations I'd planned to share but hadn't got a round tuit yet.
TL