Small perky high ass and even tighter waist. There’s a certain ass-to-waist ratio when you grab the waist when you’re doing doggy style that is optimal. Ideally, your hands shouldn’t be more than a certain distance apart while
you’re grabbing her waist at it’s narrowest point but at the same time you want to see the ass swell just enough when you slide in that her waist seems to shrink.
It's difficult to say as the shape is a thing but for arguments sake let's say there both the same shape then I would choose the smaller bum cause I have big hands and like to grab as much cheek as possible