I'd rather go Zherdev. If he pans out, we could have a player with phenomenal talent for a decade. If it doesn't pan out, we've lost nothing.
You'd rather go with a winger that has potential, but hasn't done anything over a guy that's won Stanley Cups, scoring titles and MVP awards? Not sure about that one. Obviously the Jagr the Wings would sign wouldn't be the one that achieved that greatness, but Jagr's worst year in his mid 30's was better than Zherdev's best ever.