Age will matter later, but right now all of Detroit's guys are only around 30. These top sixes seem pretty comparable to me, although there is some question as to whether or not that will actually be Chicago's top six when the season starts.
Top 6- Franzen, Zetterberg, Datsyuk, Hudler, Fillpula, Cleary
Top 6- Kane, Toews, Sharp, Bolland, Hossa, Brouwer
Edge= Chicago- 4 of those guys are still in their early 20's
This is where age is actually a factor. Although despite their elderly qualities Lidstrom-Rafalski is still a quality top pair that I think is only bettered by a couple of teams, Chicago among them.
Top 4- Lidstrom, Kronwall, Rafalski, Stuart (Last years whipping boy)
Top 4- Keith, Seabrook, Campbell, Hjalmarsson
Edge = Hawks D is much younger, skilled and faster, but the Wings, barely, only because Lidstrom is still better then all of them combined.
He of 3.5GAA in those Finals? He wasn't very impressive in the playoffs, but don't worry, neither was Howard. Considering they're both going to be playing in on their second NHL seasons this year I'm going to reserve judgment on this one.
Edge= Niemi. Stanley Cup.
In any case I don't know why you would say neither Chicago nor Detroit have the depth to be Cup contenders this year. If not them, who do you have coming out of the West? In my mind these two teams are still among the front runners in the conference.