I think my favorite version is 18.104.22.168 and 2.0
Nothing more else.
I remember I'm using 1.4.4 in years ago and now I'm not interested with it for some reasons (such of game-crashing bugs I barely remember, was when I'm customising NPC in-game editor, and etc. I couldn't remember)
Also, NSMBX is already exist, but I'm not interested with it.
Maybe I will got 2.0 in the future once my mind changed.