Uchigumori definitely works.. I've used that one before haha. I guess any soft stone that produces good slurry would work well. I bought some fingerstones form cktg a few years ago. I am still trying to work out what one particular stone is as it's very soft after soaking and I have been able to fake some finishes on my knives quite easily. It's a reddish brown stone that reads "600" (grit) and I've used it a couple of times. The package included quite a few pieces of stone- no idea what any of them are. I wager a few of them are shapton pro offcuts. I've been looking at/trying all sorts of stones trying to discover what I like.
I definitely prefer softer stones with a fair amount of mud for the feedback, even if they do gouge more readily. However, for the coarse stages, particularly during thinning, having something that stays flat it pretty important to me as stopping to flatten the stone I'm using is just a pita I don't need. I'm impatient by nature and I will probably continue using the stone even it's its not quite flat and then wonder why I have uneven finishes. I guess for me that makes diamond the winner for me, even if I hate the feedback, deep scratches and so on and so forth. Then again, that's why I have other softer, coarse stones to help with taking out those scratches. The imanishi pink brick loves covering up those scratches for me
I've never bought kings but I get the impression they are rather muddy and my rika is quite muddy too which I think I like. I had a synthetic blue aoto until I cracked it in two which from memory gave a pretty good finish also. I have a suehiro rika 5k I leave in water indefinitely and I find it rather convenient to use it in this way. I don't know if I particularly care for splash and go stones as much since I started using this stone. Wish I bought a baseless version though! I definitely meant to. I have considered trying out the 1k rika or king to compare to my sigma 1200 and chosera 1k and have that soaking along with my other goodies. The sigma certainly cuts well but isn't the most friendly feeling stone. The chosera is quite good, but I would prefer either a perma soaker or splash and go rather than something in between. I leave a beston 500, my sigma 1200 and rika 5k all in water without ill effects. I recently decided to throw my sigma 13k in there as well and it seems to perform much better after doing so, although it's debatable whether I should even bother with a finish that fine in the first place. It's pretty masturbatory but it's a handy stone for when I finally start trying out my white 2 straight razor I recently bought.
I have chosera 3k and 5k, a snow white and kitayama sitting at home as I try to discover which stones I like most and I find that I don't particular wish I had any of these stones on me at work. I think because I can leave my current lineup of stones soaking in water throughout my shift and sharpen at the very end of it makes it much more convenient than trying to weasel my way out of the kitchen half an hour before I finish just to soak my chosera/snow white stones. People get unhappy when there's a whole kitchen to clean and I'm already thinking about my knives (as usual).