Figure-eight finished off with a locking hitch. However, I agree with others that this style of cleat affords somewhat less friction surface where the locking hitch crosses the line.
As FF has said, the standing part of a dock line, meaning an eye splice or loop, should be attached to the dock or tie poles. The end on your deck cleat should be easy to uncleat and adjust or cast off on short notice.
"Less judgment than wit is more sail than ballast. Yet it must be confessed that wit give an edge to sense, and recommends it extremely." ~ William Penn