I think the straight grips are faster handling. That is why you see them on shot guns, lever actions and such. I think the pistol grips give you better trigger control. That is why on bench rest guns the grip is vertical. It gives you a better angle on the trigger, and better control of the trigger. With the fast handling guns, trigger control is secondary to how fast you can shoulder the gun and get a good sight picture. When carrying a straight stock the hand just seems to slide around it naturally as the gun is raised to the shoulder. Trigger control is not even thought of. When the gun gets into position and the sight picture is made the trigger is pulled almost unconsciously. You will not find 4 ounce trigger pulls on a shot gun or a lever action intended for real field work. It might go off before you are ready. You can have a straight stock with a raised cheek piece, but IMO they do not go well together. The idea of a straight grip is fast handling and quick sight picture. If you scope a straight grip, it kind of defeats the purpose of fast handling. As far as recoil - The gun pushes straight back from the muzzle. So perceived recoil is a function of how far the muzzle (barrel) is above the center line of the stock. It has nothing to do with straight grips or thumb hole, etc. straight grips usually have more drop that a curved grip so it feels like there is more recoil because there is more muzzle flip when fired. The real recoil is a function of the weight of a gun and the energy of the cartridge. In general straight gripped guns are lighter than curved grip stocked guns, because they are used in situations where fast handling is paramount. Recoil will feel more, because of lighter weight and stock drop. Then there is just the personal preference factor. Traditional guns usually have straight grips. I can not think of any muzzle loading guns made in the 19th century that had pistol grips. This carried over to the first modern powdered guns too. So some like the "traditional" look of the straight grip. Personally I like the straight grips on shot guns and the lever actions, but I prefer the vertical grips on a varmint/bench gun. For a field rifle, I prefer a semi - pistol grip. It kind of is a cross of the two.