DB summed it up nicely...
Personally I would be saying "get the Dreamstation" because mine works so well.... for me
But in reality you need to pick what works best for you, and if the Dreamstation does that then go for it.
My face mask is a Fisher & Paykel Eson nose mask (yes, I know Eson is nose spelled backwards
)
I have no useful input regarding full face masks, but the Eson works great for me and I have no need to change to a FFM at this stage.
Cleaning and replacement of the humidifier tank and filters on the Dreamstation is a breeze, and you will probably find you don't need to do them as often as recommended in the manual unless you are using it under adverse conditions (such as hard water/highly mineralised water, and dusty room conditions where the CPAP unit is located)
Also replacing your face mask most likely won't be required as often as recommended by the manufacturer, it will be a learning curve as you settle in to the routines.
Download Sleepyhead (link just below the top banner on this page) so you can transfer the data from the Dreamstation SD card on to your computer, it will help later if you have questions for this group regarding your AHI and other CPAP treatment numbers.
Good luck with your progress.
Cheers,
Ock.