The B/C lounge also has soup and olives. I've seen them there several times in the early afternoon.

Agree with the previous posters--A is nice but far too far to visit except on (I love this term) a Tour de Lounge. B/C is nice enough and equivalent now to the A lounge in terms of amenities. The UC is relatively junky but useful if you just need a quick snack or drink. I usually find myself going to the B/C lounge for food, and then when I'm full, I head to the UC for a few swigs of Yuengling before my flight.

Also, since we were comparing the AA/BA lounge here, I'll throw my two cents in and say that the DL SC appears to be newly renovated and has a decent self-serve snack and booze bar. Every single time I've been in, though, it's been massively overcrowded.