I may be wrong but it is my understanding that a lot of shooting in the U S is what we British called "walked up" , that is the birds rising from the ground , as opposed to our more traditional "driven ". Having had the occasion to do emergency repairs on guns from the U S that have been brought across with shooting parties and for guns that have been made or restocked for American customers , that on the whole you prefer guns with less drop the we do . If indeed you do shoot more rising bird this would be to you advantage where as if shooting drive then more drop may well be the advantage . It is also worth bearing in mind that shooting styles do or did vary from county to country as have "standard" stock dimensions ,in 1900 a British gun would have had 14&1/4" to 14&1/2" as standard ,in 2000 15" is more likely the norm .