Well then your only options are KE and CI lounges. Both have issues. Both dont have showers or toilets inside. CI is open all day and night until 11/12pm.
Food options about the same. Decor is probably worse in the KE lounge unless its been updated. But they do have a little more western food with sandwiches.CI will be all Chinese food apart from bakery items. More computers in CI and probably a little bigger at CI.

So if i had to pick i would just put CI lounge ahead but not by much this is for the business class section.