Lit / Web Components: Which Lit update cycle method would you use to determine when an update is complete?

Question

Which Lit update cycle method would you use to determine when an update is complete?

John Pencola · Accepted Answer

#updateComplete. 
The updateComplete Promise resolves when the element has finished updating. Use updateComplete to wait for an update.

Which Lit update cycle method would you use to determine when an update is complete?