Clove hitch, no question. I use extra long lines so I usually do three turns. If you're on a rough square post and not much movement that's probably enough. On a smooth round post with wave action, a clove hitch will pull around the post and loosen, so the extra half-hitch is a good idea. Note that many people take a non-clove extra starting wrap on the post. Bad idea, because the extra wrap will loosen, especially on a round post.
If you're just at the gas dock and the boat is attended, you can be pretty liberal in your interpretation. At a public/restaurant dock where I am leaving the boat, I may retie all three liners myself. (Three, because I install a center cleat for a spring line on every boat I've ever owned, and I always use a spring line.)
Not to get too far off knots, but tying to allow up and down movement rather than fore and aft movement is important. Also, proper placement of fenders will impact on your knots.
Note that in many areas, especially where the tide is significant, a spliced loop goes over the post or dock cleat and the bitter end is wrapped to a cleat on the vessel. Again, allow up and down, not fore and aft motion.
More than you wanted to know. Sorry. Fingers just won't stop.
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