The general aiming area you are using does in fact get larger, therefore you can go faster, when shooting major.
With minor yes, the gun recoils slightly less, but the target area is smaller so you must be more precise and go slightly slower.
2-3 extra rounds is small advantage, on a small percentage of stages. I shoot CO and Limited currently, and on field courses I will do one reload in both divisions. On the rare 22 or 23 round stages, I don't have to reload in CO, but there is almost always a place to fit in a reload if you have to on those stages. I've timed myself and if the position involves 3 steps or more, it's not any slower to do a reload compared to not.
If it was an advantage in any way at all, don't you think someone would try it at a major level match? NO one does.
The closest thing you have is in Single Stack, where you get 25% more rounds in your gun with minor. In that case it may be worth it, but nationals results still say Major is better.