If you really are there for a while, try them both.

For the newer WorldClub style, check out the one on Concourse C. It is right at the middle tram exit and has nice views from the inside. For a historical look back at the last generation of WorldClubs, check out the one at the F/G concourse. It usually has a couple more agents to help out with any flight/reservation questions and has more "open" seating, but the atmosphere is not as good as the one on Concourse C in my opinion. Delta recently announced a list of clubs getting renovations or "refreshing" and this F/G club could really use a little TLC/"refreshing" (not to say it's dirty, just showing its age). But sadly their list did not include either MSP club. Delta's really showing their commitment to MSP, I guess...