Choosing the Proper Snorkel?
Snorkels have changed allot but have always stayed in 3 basic categories.
Dry, Splash Guard and Basic or traditional. The dry snorkel gets its name from staying dry when you go under water, (providing the user keeps the mouthpiece in when doing so).
A dry top or splashguard style has the same attributes but not the dry feature that seals when taken under water. The splashguard keeps water from freely entering the breathing tube when a wave may accidentally come over or the user mistakenly dips it under.
The jaw fatigue factor is not as important as usually you don’t need to use it as often.