I ordered a 26" Miflex hose for my primary and 40" for the octo. I can try it on land for feel and can always exchange for different length. I borrowed an idea from tech diving and use a bungee necklace for my primary second stage so I never loose this reg. It can be pulled out in emergency. My octo is on the longer hose and is what I use for sharing and is attached with a magnetic holder. The system works well for me.
I pointed out a potential problem with an angle or swivel adapter in another forum. Both, when pressurized, can exert a torque on the second stage connection and cause it to loosen and leak. I speak from experience as I used the Atomic swivel in the past and it happened to me. So if you use an adapter you need to make sure the connection is tight before each dive.
Adam