I tend to put more stock in championships than culture for UFA signings.
Both culture and championships take more than one man to build, but at the very least we can see the impact of the player on the former, on the ice. I don't know what Chara did behind the scenes, or how much he contributed to their culture vs Bergeron or the coach, or the management seeking out specific attributes in players, etc. I'm sure Chara DID have impact on the Bruins culture, cause he's an incredible player and quite a presence, I just can't say how much he did. Whereas I can see exactly what Hossa did on the ice to put the Blackhawks over the top.
More over.... winning Championships is kind of the goal of this whole thing. You want great culture because you believe it will help you compete for and win championships. Culture for the sake of culture doesn't really mean much at the end of the day.
So I voted Hossa, but understand why Chara is winning the poll.