I will suggest you store the 2020 because it is 'old', 'not 4wd,' 'not easy to change implements,' 'maybe hard to start,' 'controls not super easy,' etc. In other words, it is Not the fact that it does not have a cab. I mean, how long do you actually sit on any tractor in the winter for any task?
And that leads me to next point - I am constantly on/off mine unless brush hogging maybe. I do not want to get in/out a cab continuously. BUT, if you do indeed plan to spend long hours in the seat at a time, sure - get the cab version.