Some people have rings that are so tightly stuck that even soap does not help, but dental floss works for them. Meanwhile, others find dental floss painful even with a mildly stuck ring, yet soap works well for very tight rings. Why is some skin more sensitive to dental floss? And what makes some people’s skin respond better to either soap or dental floss?
I would suggest the data you have is not reliable enough for this comparison. For starters, not all dental floss is the same. Secondly skill and technique may vary.