The only things that come to mind is a 5 year warranty on a 2019 model might expire in 2024 whereas it might expire in 2025 on a 2020 mode. You would want to clarify that with the dealer before you made your purchase because if the above is true, on the 2019 you would only be getting a 4 year warranty. If not, then purchasing the 2019, at a significant discount, makes eminent sense.
The other thing is, there are times when the 2020 model might have desirable equipment available the 2019 wouldnât.