Which is better?
It depends. The Amara from respironics covers the nose and mouth to between the lower lip and the chin. Headgeat ajsustments are via velcro closures. I learned very quickly that the mask needed to be tight or the pressure would force leaks around the edges. Over time the headgear has stretched.
The Forma from Fisher & Paykel hooks slightly under the jaw. The headgear has a clasp that one uses to unhook the gear when taking the mask off.
Both seem to keep the jaw closed although the Forma does a better job.
Other than that both masks are very similer. Both masks use a soft insert that expands when under pressure and seals. The Forma Has heavy foam cushioning underneath the insert while the Amara has another silicone seal.
In terms of comfort and price the Amara is slightly better UNTIL the mask gets blown off your face and leaks. The Forma seems to stay on my face better and not get blown off as easily.