I base this on my and my wifes experience with both. On FFM my top pressure has to be 18 and I will still have clusters at times. AHI will never go under 2
On FFM my wife needs a top pressure of 16 and will hit the ceiling on occasion. AhI will never go under 1.5
On a nasal mask not pillows my top pressure never goes above 12 and usually never goes above 10. AHI drops to .3 to .6.
wifes drops to max of 9 ahi 0 to .5.
Leak rates run with either well within limits actually quite low.
Not everyone can use a nasal. I was told I would never be able too by the Doc and sleep lab. But I do use one with a chinstrap every night and keep a Simplus FFM as a back up for when I have a very very bad cold and to congested for a nasal though that is rare.
My two cents is if you can use a nasal mask go to one and itll likely dramatically improve your numbers and drop your max pressures.
Recommend a F&P Eson personally but masks are personal things. Example alot of folks swear by the Mirage FFM. All ive ever seen one do to me or my wife or two of my friends was make a huge sore on the bridge of their nose, on my wife in one night adjusted very loosely, that took two weeks to heal up while using a simplus FFM instead.
yet others swear by them so as I said what brand of mask works for me may not work for you.