First, myBB mod for automatic dumping of database was not yet complete when I tried using it. It s_cks for a lazy admin like me to do the backup of my database everyday manually.
Next, there's no style.css file in myBB and it s_cks to do the editing of the theme in their somewhat WYSIWYG admin panel. I like to edit css file with a text editor but it seems myBB won't allow it. Style.css of SMF is a mess, honestly, but at least I can access it.
And some other posting functionalities (or maybe mods) not present in myBB, just that I can't remember them exactly right now.