Favorite? Number One. Because it was the first one and the biggest surprise.
Best? Number Two. Because it was more complex and ambitious and actually succeeded in everything it set out to do.
Absolutely underrated? Number Three. Because it told its interesting story extremely well and treated its characters to an intelligent continuation of their arcs. The press slaughtered it like other films before that became classics - and lazy journalists still use the "Sofia is a bad actress"-argument, although she actually brings a welcome note of realness to the proceedings.