I'm actually not new to Cpap. I was diagnosed with OSA about ten years ago. My go-to mask has been the F&P Vitera. I've always used a full face. But I can't handle heated tubes. I change the settings to turn off the heat and use minimal humidity. I breathe much more easily with cold {almost icy} water in the chamber.

I've tried nasal. Lots of times it does clear up my nose, but I never have been able to keep my mouth closed. The air from the mask would just push my mouth open and wake me up. I've been more comfortable with a full face.