I'm not just looking at the movies, I'm looking at the Comics too. Not sure why everyone thinks Darth Vader is better... Boba Fett won in battle against him and fled without a hair on his head being harmed. Boba Fett had a chance to kill Darth Vader but choose not to because he knew that Darth Vader would need him again sometime in the future.
you're missing the point. How can he almost kill vader when in the movie we see him get his butt handed to him by Luke (who wasn't really a jedi) and a blind Han Solo.