Both are great Westerns and I own both. No question in my mind it's "Outlaw Josie Wales".
Josie Wales was a look at our country after the War Between the States and how people were raw from our biggest war ever. Josie starts in a typical spaghetti western style with an everyday man having a huge trauma hit him with the death/murder of his family, and the revenge approach is the fodder of many movies.
However, this is where Josie departs from the spaghetti format by changing during the course of the movie - moves from family man to guerilla fighter to outlaw that refuses to surrender to what we assume is a man tired of fighting and willing to settle down to try the family life again.
Most of the spaghetti genre doesn't have our hero settling down, but settling a score and the movie ends there. Josie's saga goes beyond that, a man that is hounded by the war's cost and the Union hunting him, but doesn't really want the fight.
IMHO, anyway...
P.S. - It's interesting this poll caught my eye as I was seriously thinking about posting something simliar!