I had a 2020 Rebel that i loved but traded in on my ZR2. Below is copied from one of my last post over on 5th Gen Rams forum. It's my comparison between the two trucks after owning the ZR2 for a month.....
For anyone interested, here is my (almost) one month comparison between my ZR2 and my Rebel:
Ride: my Rebel had coils and the ZR2 has leaf springs with Multimatic DSSV shocks. It's REALLY close but I'd have to give it to Ram on pavement and ZR2 off road.
Comfort: it's a tie. The seats in the Ram are more comfortable but the overall experience in the ZR2 is nicer. PLUS ITS GOT A DEAD PEDAL!!!!
Off road capability: ZR2. It has front and rear lockers, 4 lo and hi and goes like a mountain goat! No comparison!
Interior storage: Rebel by far! The ZR2 has very little interior storage in the console and no floor buckets.
Engine / Transmission: ZR2. 6.2L and 10 speed transmission with no throttle lag!
Infotainment: Ram, but a tie between my Rebel and ZR2. If my Rebel had one of the upper level stereos I'd have to give this one to Ram. The Bose stereo is pretty anemic. Plus, GM is pretty effed in the head by installing commands on the truck that you can only use if you purchase their OnStar system with WIFI or teather to your phones WIFI hotspot. You can't even change the temperature or fan speed on the HVAC by voice without OnStar or tethering. Crazy!
Exterior Design: Completely subjective but I'm giving this one the the ZR2. When I bought my Rebel, it was a specialized trim level with its own hood and shared wheels and lift with the off road package. Now, you just about have to look at the trim badge or front bumper to see what kind of Ram you're looking at. A lot of the Rams now look a lot alike.
Price: A Rebel GT cost the same as a ZR2.
And finally, fuel milage: No one buys these things for fuel milage, but in the interest of a complete comparison, this is a tie!!! I've driven both trucks the same, same roads, same route and according to their onboard calcs, they are within .2 tenths of each other with the ZR2 edging out the Rebel. The ONLY way I can explain this is I used midgrade, 87 octane fuel in the Rebel and a combination of 87 and 95 in the ZR2. I've used Shell fuel in both every fillup.
Well, there it is for what it's worth.