I must be the only one in this universe, PS4 versions full updated, that i prefer 2020 over 2021 gameplay wise.
I like more that 2020 lagish but smooth and slow tempo, over the more responsive but more frentic from time to time tempo of 2021.
Also since i play on Master League Superstar and CPU almost 99% of time is reading input, I can't take advantage of increased responsiveness.
For example trap feint, leave the ball and run or whatever is named, in 2020 it is more OP, works almost 9 of 10 times, while while in 2021 is less effective, works variety of 5/10 to 7/10 times, depending on situation, IE even when you make it work, the AI can stop you with a no-call-foul-rugby tackle, or a clipping-stick a leg through your body, etc..
On the AI as
@Hatrickhero said above, it is very shallow and repeatitve in both games.
At least, the good part, the AI is not spacestellar extradimensional cheating like in 2019 and 2018, where in my side is the No#1 reason , that two old games are unplayable on ML Superstar.