Another fan of the humpbacks - I own both and they’re my only J-frames. Both are great, but the .357 649 is probably my favorite handgun period. The weight and SS have a more solid/quality feel to it, the additional weight makes 38s and +Ps more accurate and a pleasure to shoot. 357s are not a whole lot of fun, but you get used it and I like having that option to theoretically offset the capacity disadvantage. If I pocket carried, then the 638’s weight advantage would count more, but for AIWB and OWB where my belt carries it, the additional weight is worth it to me.