Banana cut are supposedly the quietest, followed by parabolic and then shield, but there's not a lot of difference among them. Cut height and amount of helical/offset also affects noise, probabloy as much as feather shape, but again, the amount is very slight. A scruffy/worn feather or feather with a piece missing can create a lot of noise.
I've shot shield for more than 40 years and can't say I've ever had a critter spook because of feather noise. Well maybe a squirrel or two as a flu-flu zoomed past its head.
At hunting distances, the critter is going to hear the bow go off long before it hears feather noise. By the time it hears feather noise, it's too late for it to react.