Hell or High Water, Wind River, Open Range, Bone Tomahawk, True Grit, The Revenant, The Assassination of Jesse James by the Coward Robert Ford, Django Unchained, The Hateful Eight, The Ballad of Buster Scruggs, The Three Burials of Melquiades Estrada, The Proposition, Bury My Heart at Wounded Knee, and Hostiles are all great westerns.
But No Country for Old Men, There Will Be Blood, and 3:10 to Yuma stand above and apart.
Absolute domination for No Country for Old Men. Not even close.
No Country is excellent for the first half or two thirds but then it just falls flat on it's face after that.
These two and 3:10 to Yuma are the greatest westerns of the 21st century so far.
A lot of people say this. I feel it's because they are missing the major theme of the movie- think about the coin scene. It all makes sense against that context.