I'm glad I do not have to deal with pilings, escept at the end of the finger pier! With max 12-14' tides, trying to figure out the correct length lines etc would NOT be fun. Kinda nice to just reasonably tighten the lines to cleats on finger pier, and boat goes up and down with the tide and pier!
If tied to a piling, I would think wider the better if you have much tide change.
She drives me boat,
I drives me dinghy!