Depending on miles, it might just be worth it to put a clutch kit in and keep the 2020. You will probably take a bigger hit on your 2020 then what the 2.75 track is worth.
The downside of the 21 is the drivers. I felt my 21 Khaos was held back by how tight the track had to run so it would not ratchet. I went with extroverts and notice the difference. Polaris is supposed to be addressing that this year.
The track does work extremely well but I have to admit that there was a lot of hero snow last season so not sure if it got the same test as it would have in previous years. Comparing to my 2019 174.