there is no such thing as a general "best" feather shape/cut. that's like asking "what bow is best" or "what arrow shaft is best".
if you wanna know what feather shape works "best" for you, give 'em ALL a fair try.
add into the testing the number of feathers, feather length and height, feather placement (straight, offset, helical).
as you can see, there's a huge buncha testing & trialing to accomplish.
my preference is 4-fletch 75x105 low profile banana, 4" to 4-1/2" length, 3/8" to 5/8" feather height, 1 degree offset. this works well for me - quiet, low drag, and more than enuf surface area to aid in controlling the arrow.
ymmv.