I use the waterproof labels for labeling containers that will be near water and may be splashed repeatedly.
I like the flexibility of printing my labels on a full sheet label, then cutting each individual label out with an adjustable circle cutter. I tried using the pre-cut circle labels, but was frustrated because I could not get good print alignment, so I went the manual cutting route instead. I also laminate the sheet of printed labels (using a roll of clear self-adhesive vinyl) before cutting, because I find laser toner is easily scraped off the vinyl label sheet. Even though the label material itself is waterproof, the printed image wears off unless protected.