The most effective for my taste

I recently tried (and did try ...) Various products (Best Breathe, Air Clip, Airmax).
A few nights of addiction are anyway required for all products:
better ventilation causes drying of the nose and must get used to breathe less strong (too much!).

Then the choice is comfort, air flow noise, etc.
This is very subjective and it is difficult to rely on the comments. It is best to test several models ...

The advantage of this product is to be "sealed", thanks to the sufficiently long tubes and the choice between four sizes provided.

It is not sold in one size but according to the leaflet, can last for years, unlike most other models.