Do I need wall and waterline climbing?

If algae and scum tend to collect at your waterline, a model that scrubs walls and the waterline band (like the WYBOT C1 or the track-drive cordless unit) saves manual brushing. Floor-only cleaners cost less and are fine for pools where debris mostly settles to the bottom. Buyers who skipped this feature and later regretted it usually cite a persistent waterline ring.