They've added a bit more here and there to the Rebel, almost making it on par with a Laramie for availability features/options. If you look at the Ram website, the Rebel is even listed above the Laramie now, although that may be due to price (higher) than options. The 360 camera is an option for 2021.
The Longhorns and Limiteds (and TRX) have the LED projector headlights that are ranked best OEM lights in the truck world right now. The only lights that are in the same ball park are the Honda Ridgeline's, pending the new 2021 F-150 LED projector headlights being officially tested. That being said, the Rebel/Laramie/Bighorn (with upgraded headlights option) LED reflector headlights are no slouch.
The Longhorns/Limiteds have more leather, and a lot of it is real leather, not the synthetic stuff. Maybe that doesn't matter, but it is a difference.
Ventilated seats are nice. Got the rear ventilated seats in my Limited as well, which I believe are not offered on any other trucks, not even the new 2021 F-150. My father and brother-in-law appreciated that last summer.
Just a few differences off the top of my head. I am sure there are others I've forgotten.
The Rebel is meant to be a Raptor-lite or a TRX-lite type truck, although with some of the available options, that image is kinda distorted now.
The Limited is meant to be a luxury truck.
Nothing wrong with either, pick which one you like better and be happy.
