On B side in ideal condition you have 0dv/dt. Because that is constant DC voltage smoothed by capacitor. in reality, you have some ripple...
On side A you have in one moment Vin, in next momement you have 0V. So there is source of your EMI. If you must choose right side of inductor, then you have much more problems in your design. Layout is 1000 times more important than side of inductor.
Just don't make terible PBC, and you don't have to worry about it... Especialy if your product is not going for certification...