I suppose this is common sense but just for clarity any anime which received a 10 from me is automatically considered a favorite anime of mine since I never would have given it a 10 otherwise. Thus the only anime in my favorite section will be those having a score of 9.
Also if an anime with the score of 9 is a part of series and its sequel has a 10 score, then the first part will also be considered a favorite.
Sports anime will always range from 6-8 in my list, with some exceptions (don't ask me why, I'm weird that way.)
I'm very lenient when it comes to scoring an anime and thus most titles will receive a 7 or over it, if I like them enough. 6 means average, whereas 5 is below average. Incidentally that's also the lowest score I give to an anime, unless it pissed me off in a major way.