I have the PD version of 2020 and bought the standard 2024. Glad I did because some of the additional 2020 inclusions in 2024, such as the T6 and P51 are those from the Reno pack, for example, and not really worth having due to their limited functions and flight models. The new aircraft/helicopters are OK, and worth having, although not necsessarily ones I will use that much.