Best Coen Brothers film?
I just watched Miller's Cossing again, and I also enjoyed both RAISING Arizona and O Brother where art thou.
I prefer Favorite as a designation because Best is such a volatile standard from person to person, but it's definitely Inside Llewyn Davis for me--surprisingly empathic for the Coens, & the musical performances are top-notch. Close second: Lebowski--what's not to love? Most overrated: The True Grit remake. Least favorite: The Ladykillers remake.
I agree Inside Llewyn Davis is underrated, but I think that movie also suffers a bit from a lack of iconic moments. I only saw it once, but very little stuck with me, unlike say No Country For Old Men, which I’ve also seen once but there are a number of very memorable scenes.