NRT hands down. The lounges are hip, chic and lots of good tasty treats, sushi, two sakis, automatic draft beer machines, soups, sandwiches, showers, and much more. The DTW lounges and the C-concourse at MSP are nice too but NRT is the best Skyteam wide.

The only better lounge that I've been to is the China Airlines Dynasty Lounge (granted there are some other sweet lounges that I have read about) that is better because they have a made-to-order noodle bar and other tasty treats....

Of course it depends on how much time you'd have in each connection....