Just to summarize... let me know if I got it right. I'm very interested in lappability. I have had a lot of struggle flattening my Tyrolit stones.

Naniwa Chosera - super good but pricey. Stays flat.
Other Naniwas - very good an affordable
King - diverging opinions about the scratch pattern. Needs a lot of lapping
Suehiro - super good (finer than the grit would let you believe), not too pricey, stays flat