HUGE apologies for my earlier post gaff, really embarrasing...guess I'm the Blind Guy now, eh? Hah!
A Blind Buy of a mask in my opinion is really tough to hit the mark. It'll take some serious forum searching to find a consensus from one person to another that feels the same way about the same mask. Personally I use F30 now exclusively, where I used to rotate between the Amara View, Dreamwear Full and the F30. I grew tired of the other two and donated to a friend, but at one time I was totally inlove with the Amara View, then I don't know what, something changed and then I could never use again. I never hated the Dreamwear, nothing really threw me off of it, it was always just kinda mediocre for me.
Don't even get me started on the F20. But, I know a lot of people here swear by and really love that mask. It was my starter mask and I couldn't run away from it quick enough.
You mentioned that you couldn't get access to the F30 (I'm not trying to push you there, only mention because you stated you couldn't get it.) Well, if you can recieve Amazon shipping at your place in Brazil, then you might wanna check this link:
https://www.amazon.com/s?k=resmed+f30&ref=nb_sb_noss_1 They have all three pieces there that you need. Though if you do decide this will work, I'd actually opt out the the Resmed headgear and go with the Amara View Headgear (only, not whole setup) it's much more comfortable, works great. I'm about to order another for myself.
If you check around, you might be able to find someone willing to donate you a mask they're no longer using to help minimize your risk.