Would you believe due to the size of the N-frame, I find the "service" type grips very comfy , about the same as the Hogue mono-grip on my 629 - which are slimmer then the stock "target" grips.
K-frame does benefit from the larger "target" grips for my hands, but are too bad without them, I would assume the same for L-frame since they're closer to the K rather then the N-frame in dimensions.
X-frames are just weird.....
J-frames suck and do need larger grips - mind you I assume they would suit a petite female, not that there are any petite revolver operators on Arnies to confir