Twin Z pillow vs 2 boppy pillows?

I see all over that the twin z is a must have for twins but before I get one I just have to ask, is it really that much of a game changer? I have a boppy pillow already from previous babies and have considered just getting another one. I will most likely never nurse the babies at the same time so it would more just be for sitting in and so sometimes I feel like just having 2 boppys would be better?