In my opinion the best of the trio is FOR A FEW DOLLARS MORE. The use of veteran Hollywood heavy Lee Van Cleef as another antihero was a stroke of genius. It linked the classic American western to the new Italian genre. The story was original and the sparing between Clint and Lee was great fun to watch.
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In my view the best has got to be a fistful of dollars, mainly because it was so different at the time to most other films which portrayed the hero as a goof guy