There is going to be little real difference between years other than cosmetics, so I'd focus mostly on low miles. Fun fact is that most for sale will have very low miles, as people think they want a bike like this and then find that it's too much for them.
I have a red 2020 R3- the fastest color
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Model Year Changes
- 2019: Introduction of the Rocket 3 with a new engine and design.
- 2020-2023: Minor updates focused on performance tuning and rider comfort.
- 2024: Enhanced features for both R and GT models, including improved suspension and braking systems.
The Rocket 3 R is designed for performance enthusiasts, while the GT caters to those seeking comfort for long-distance rides. Each model maintains the powerful engine and distinctive styling that the Rocket series is known for.
Wikipedia