I think the larger diameter hose would give you better results. Think of the difference in water pressure when using a small diameter water hose versus a larger diameter. It has been my experience that the larger diameter is better able to maintain pressure.
I had no noticeable differences in performance when I switched from the 6' hose to the 10' hose with my DreamStation. The PR AirFit P10 I use has a short 15mm hose attached so I have switched back to a 6' hose.
I like the 15mm hoses better than the 22mm. The 15mm is lighter and more flexible. If I was going to hook two hoses together I would probably use a 22mm coming off of the machine connected to a 15mm going to the mask.
I use FlashPAP to load data from a FlashAir III wifi sd card in my machine to my computer and display it with SleepyHead .
robysue's Beginner's Guide to SleepyHead