I much prefer the small diameter round ones vs the large diameter oval ones.
That said, Ron is right, shorter is often the way to go unless you're installing an Air2. Then you want it long enough to be able to turn your head with the Air2 in your mouth. Then you need a good way to secure the longer hose down to your shoulder strap. I use hose magnet clips. Coating the neo magnets with epoxy to prevent rust. Solid system I've been using for years.
Swapping them out, even with the pull to dump is simple and takes 15 minutes. Cut zipties or unscrew fancy cable clamp, push pull cord pins, replace with new.