Toews - complete package
Crosby - the best talent of list, but Toews is more mature
Alfredsson - been doing it for years
Callahan - guy who will do it all to win
Doan - another veteran guy, but not a whole lot of postseason success to show
To me won't comment on the other Captains, but as a sens fan, Alfie is the perfect captain.
Just listening to how he's been with players like Karlsson and the rookies, and then how MacLean just raves about how much of a leader/help Alfie is behind the scenes (aka he wouldn't be voted for Jack Adams if it wasn't for him). I think Alfie is an amazing captain. He also, as a player, is incredibly consistent.
That said, what defines a "great" captain? Is it best player who IS a captain? Or best leader for a team?
Really not all that easy to define what you mean by best captain. So depends on the interpretation of what you mean what I would actually pick.