Well, my alltime favorite legendarys are Mew, Latias, and Manaphy. I've never really thought about which one I liked best. I'd say Mew, even if it is "overloved". I don't like it just because it's popular, I like it because it's cute, a great pokemon, and I love its personality in the movies. Plus, it was the very first legendary in the series. (along with MewTwo) Latias and Manaphy are pretty darn awesome though.