For how we live.
Both brands sell drug-free external nasal dilators with much the same evidence behind them. The differences are range, materials, and the fact that only one also sells a mouth tape.
It is a strip of tape over the lips at night, meant to force nose breathing. The idea is simple; the safety caveat is the part that matters most.
The remedies that work are the ones matched to the cause — nose, mouth, tongue or palate. Here is what the trials support, and the sign that means see a doctor first.
External nasal strips have real, repeatable evidence behind mild snoring relief. They have never been shown to treat sleep apnea, and the two problems are not the same problem.
The practice has real theory behind it and a genuine safety warning attached to it. The studies are small, mostly low quality, and say less than either side of the debate claims.