What is the better finish for a swimming pool smooth or rough finish?
- It depends on your tendency and preference.
- Smooth finishing is good in that it makes cleaning easier but it increases the risk of slipping.
- However, rough finishing is better to avoid slipping but it makes cleaning not so easy.
Both might be ok, informally, with different meaning. Unsmooth would be a verb, meaning to roughen, as a surface: I unsmoothed it with scratchy, rough sand-paper. Non-smooth would be an adjective: Stand on the non-smooth part for better traction. But it is better to use roughen for the verb and rough for the adjective.