If you are loading to the same power factor. The different weight bullets will give you a different felling in preserved recoil. I personally like heavier bullets 180gr in 40 and 147gr in 9mm. I fell the recoil is more of a push compared to a snap like I get with lighter bullets. I fell I can get back on target faster with the push compared to the snap. Get some of each load them up and see what you like.