Liberty Sanders
Master
One of the nice things about revolvers is there's a *ton* of grip/stock options out there. Everything from splinter grips to sticky rubberized grips to custom carved works of art. Since you don't need to fit a magazine in the middle of your fist, you have a lot more options.
I'm move of a Ruger guy, and the popular options there are:
GP100. The Match Champion is a nice gun out of the box. Good sights, decent trigger, and great durability. The factory grip is ginormous, good if you have large hands but not great if you want to conceal and/or can't palm a bowling ball. I put compact grips on mine and it's very easy to carry.
SP101. Sort of the opposite problem. Trigger reach is on the short side, so if you do have bigger hands it can feel cramped and make the trigger feel heavier than it is. Personally, I've no use for the SP101. It's big and heavy enough that if I can carry it, I can carry a GP100.
LCR: Not on your list, but an easy to carry gun with a very nice trigger and that's comfortable to shoot (subjectively of course) with up to 125 gr .357 mags. Full house 158 gr are not fun.
I don't really know much about the Kimber K6S.
S&W, your options are broadly divided up into frame sizes. J, K, L, and N frame all have .357 mag offerings (listed smallest to largest). N-frames will withstand a *lot* of full house magnums. I've been kicking around picking up a 6" Model 28 for awhile now because reasons. Depending on how much you shoot, and how hot a load you shoot, you may want to avoid J and K frames. I'd think of them as .38s you can run some .357s through, but for a dedicated magnum gun I'd go with the GP100 or L/N frame S&W.
If you want to cheap it out, Taurus makes a reasonable quality revolver that mimics the S&W. Again, though, if you intend to shoot a lot of full house loads I don't know I'd go that direction.
I'm also with Liberty on avoiding the lock equipped S&W. It's rare, but they do lock up under recoil. Plus, for me, it ruins the aesthetics and any pride of ownership I would have because of the origins of the lock. Just a reminder of a dark time for gun owners.
Yeah...this too.