I relly prefer Olivier's, done during WWII Britain. I know it's fantasy, but the first flight of long bow arrows at Agincourt still gives me the chills, and the college audience I first saw this film with audibly gasped at the scene.
Brannaugh's Agincourt on the other hand was a muddy mess. Probably closer to the truth of the battle, but not nearly as inspiring.
I do love Brannaugh's Hamlet, however. My God, it's complete! If only it were available on DVD.