There's choices because everyone has different preferences.
Lots of freedivers I respect hold to the "simple J tube or nothing" school of thought. Simple, nothing to break...put it on the back of the mask strap, and it swivels out of the way when you're underwater...simple is good, right?
Hmmmm.
Weeelll....I'm a freediver, too. Up until a month ago, I was one of the simple J tube folks. Then, a fellow freediver talked me into trying her
Riffe Stable snorkel. It took some talking, because this has
the dreaded purge valve. OMG. And even worse, it just didn't look very "purist".
It only took one freediving session for me to kick my J-tubes to the curb. This snorkel produced the easiest, driest, best breath-ups I've ever had! For me, being on the surface is all about breathing, to prep for the next dive, and the Stable is perfect for that.
The clip is solid and attaches to the back of the strap even better than my old school J's; it flips to the back of the neck when I spit it out; and clears better than any snorkel I've used yet. No more rattling during breathe-ups. You can't help but fall in love with it.
Every freediver I know, that has used it, ditches their old snorkel. Me included.
...And taught me a lesson about keeping an open mind.
All the best, James