I have a 2-game collection: AFMrLE and MMr. I love both games and couldn’t be happier. Although there are similarities in the layout there are enough differences in theme, art, music, call outs, and rules that I wouldn’t hesitate to get both, even if they are your only two games.
My advice is to buy the games you love most. If in doubt you could do far worse than buying the all-time classics for your home collection and playing the newer games on location. I learned this lesson the hard way.