Is closed guard good for the top or bottom fighter?

Both have options, but bottom usually controls more threats while top must earn a safe pass or posture.

When should top posture?

After building advantage or denying a bottom transition, with enough stamina left to defend.

After a denial or when Grapple Advantage makes the transition fast enough to avoid an easy block.

Closed guard is a two-sided position: bottom controls choices, while top must earn posture or a pass without giving away a sweep.

UFC 6 closed guard guide for top and bottom: transition threats, denials, posture, Grapple Advantage, sweeps, and safe ways to stand.