Originally Posted by
VRFast
I assume you mean C10? (Polaris is at C18).
Is the C10 lounge the newest and biggest UC at ORD? We’re flying out on Sunday afternoon and want to use our Chase UC passes. I guess we could go to the UC at B18 as well.
Definitely agree and suggest a visit to downtown Chi-town instead of 12 hrs at ORD. At least to try out the deep dish pizza which is pretty much the only thing we’ve had for dinner the last couple of days here

Ah yes, I suppose C10 is a more accurate locator. I think of it as go to PL and then keep going, so that's what C18 came from.
C18 C10 is the newest location with more food variety, but B6 is the largest, and especially with the new one open it tends to be least crowded.
I would only go to B18 if that is where your gate is and you don't plan to be there for very long.