Which installment of the Heroes series had the best campaign storyline for you?

I liked the campaigns in the third game the most – they were cohesive, interesting, and had a good storyline, which I didn't notice in the fourth game, for example... I won't comment on the second game, as I didn't complete all the campaigns... And the "Chronicles of Heroes" were made for the third game for a reason, although I'm not arguing that they didn't do it for the later parts, probably considering the experiment not very successful...