The King 1k gets dogged a bit when it's actually a pretty good stone. It needs no more soak that 80% of the stones mentioned and for being "slow" it's actually not that slow. It does wear as fast as a clay brick but it's also one of the best stones to bring out the contrast of single bevel knives.
The Arashiyama stone can be thought of as a upgrade to the king stone. Wider, harder, wears slower, cuts a bit faster and still produces a nice mud while being a pleasure to use.
Nubatama bamboo 1k gold, this stone was a hard ceramic-like stone that had a similar feel to a king, mud production like a Chosera and cutting speed of something between. This stone did well for me except it wore quickly and would release random large particles that would produce shiny scratches, this was mostly a issue with larger bevels.
Nubatama Ume speckled 1k, I have used all three hardness variations and prefer the XXHard version. The medium was like the 1k bamboo so for me it was too soft. The hard I could not tell much of a difference with but the XXHard was something to be noticed, it was a lot harder and more resistant to wear but also slightly coarser and faster cutting. By scratch pattern alone it looks like a 800ish grit stone and left a brighter scratch pattern vs the more Kasumi finish of the "softer" Nubatama stones. I really like the aggressive nature of this stone but dislike its coarser grind pattern due to its difficulty to remove with finer stones.
Shapton Pro 1k, hardest stone I have ever used but has that gripping smooth grinding feel of a King. Supreme grinding power able to handle very wear resistant steels. You would probably be wise to flatten these after every use, a dished Shapton would not be fun to flatten.
Sigma select II 1200, a customer brought one of these in for me to try. It was hard like a Shapton but needed to be soaked like a king. It was fast but loaded with all the removed metal and needed diamond plate lapping to remove. I did not like this stone.
Ohishi 1k, I unfortunately had the chance to use these stones. Slower than a King and just overall not impressive.
Chosera 800, the Chosera 1k is the only Chosera stone I have not used. I at first did not like Chosera stones but over time grew to like them and happily recommend them. The whole line has a smooth feel that is very enjoyable. They are hard and wear very slow like shaptons though I wouldn't say they are as hard. They produce a mud/slurry very fast and this can be used for some types of polishing.
I guess I should have just done this from the start but I was being lazy
Overall I would say the Chosera, Shapton, and Ume XXHard have been some of my best 1k (ish) stones.