Going from a 6" to a 4" will only loose about 75fps in velocity , contrary to what some might say . The sight radius on the 6" definitely helps with accuracy . I shoot a 4" a lot and have found that with some practice , I shoot it was well as the 6" . As far as carrying , a 6" carries about as well as the 4" . The 4" will clear the holster faster . If you are going to carry " cross draw " or a " chest holster " , then I would definitely go with the 6" . As far as recoil , I have shot a 4" so much that I really don't notice much difference between the 4" and my 6" . Getting grips that fit your hand very comfortable is very important . I do not care for the new S&W target grips . They are very slim and wide . They feel like you are trying to wrap your hand around a 1x6 board . I hope this helps , good luck . Paul