2nd Gig/The Individual Eleven is arguably BETTER than the first Standalone Complex/The Laughing Man.

Solid State Society is a decent followup movie.

I have no idea about the Netflix SAC series, but the only thing good I've heard about it is that it keeps the SAC series voice cast.

EDIT: Oh, and make sure it's the SAC 2nd Gig series you watch, not the Individual Eleven condensed OVA.

2nd Gig/The Individual Eleven is arguably BETTER than the first Standalone Complex/The Laughing Man.

Solid State Society is a decent followup movie.

I have no idea about the Netflix SAC series, but the only thing good I've heard about it is that it keeps the SAC series voice cast.