Who has a bigger fan base? Who is loved the most based on the games? Which series has more followers? Consider these kinds of questions before answering, and don't necessarily base it off of personal opinion.
My vote goes to ezio. I've never met someone who dislikes him, but I've seen a few who dislike chief.
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More people like the chief. Halo in general has a bigger fan base.
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Chief. Ezio is the only assassin that's cool IMO though.