Does the hub location fit into your criteria? Being from the midwest, I would choose CO since I think MSP is too far out of the way and DTW has been just plain bad luck (seven NW flights - six major delays).

My friend's family was stuck for two days at DTW over this past New Year's weather fiasco. Fortunately they ended up staying at the airport Wyndham.

Not that there aren't significant delays at CLE or EWR, though.

The bottom line: I feel as though I have received better service and timeliness from CO and I feel better connecting at CLE.