The general seating in SQ and OZ are roughly equivalent.

OZ does have proper loungers if you plan on resting/napping.

The food in SQ is definitely better. Higher quality and tastier.

SQ has a wider range of self-service canned drinks, OZ had limited canned options but also fountain options.

Can't speak to the bar service in either, didn't use them.

I'm only going back to OZ later because SQ is closing before my boarding time.