Should I buy a zero gravity chair or a triangle cushion?

I heard that moving the upper body is the most difficult after breast surgery, so
 I want to buy something that will help me as much as possible. I
 searched and found that a lot of people use zero-gravity chairs...
 But I'm worried that treatment will be difficult later because the room size is small.
 Will a triangular cushion be enough to keep my body comfortable? ㅠㅠ
 They say it's the most stable, so I'm trying to buy everything I can...
 And I was recommended Motiva in ㅇㅇㅇ and ㅇㅈ, and
 Menek in ㅂㄴㄴ and ㅁㅂ.
 What do surgeons doing their first surgery do if they have to choose between Motiva and Menek? ?
 (Assuming you have a generous budget.)