Reply to Building a studio room?

Hi all, I'm moving house and I want to create a room for myself specifically dedicated to producing.

Unfortunately, I don't have any experience at all and I need some advice for choosing an adequate room. I have a choice between a large, kinda rectangular room or a much much smaller rectangular room. There is also a room that looks like a cube but I heard that is the worst case scenario

so my question is, bigger = better?

I already have good montiors but I really want to get the most out of them, help is appreciated