If I'm a solver, I'd rather enter just a letter for a cell (For example the Easy As Cup puzzle in the recent Moscow Cup) rather than entering a string of letters describing a row/column like for example UTTTSSSSSTTT. If you just circle/mark a bunch of cells, meaning I have to enter a letter describing each of those cells in isolation, you can cover the puzzle with 5-6 descriptive cells and its less work for me as I can just jot down the letter in small in the marked cell as I'm solving.

As we encounted in the USPC the other year, if you go with "letters in order visited clockwise", it's good to put the starting letter on the edge of the puzzle.
For example, starting from point F, mathematically "clockwise" would go upwards, but many folks would assume it went leftwards.