I am loving my JNat experience so far - and I want to go further. Currently, I have a 60's barber's hone - Honyama Asagi Tomae (Lvl. 5) -that I use with asano and tomo nagura. Before that I use my Chosera 1k to set a bevel and mix up stages of my JNat with my Shapton Pros (5, 8, 12k)...which are likely on their way to BST (well the 8 and 12K most likely). Happy to continue with the Chosera to set the bevel but looking to introduce a pre-finisher Jnat before I move to my current Awesedo.

I have a great source of tested stones and have narrowed my search down to:
a) Tsushima Black (full-size), or
b) Yellow Suita (king-size).

Price is not a concern - as they're equivalent.

I'm already leaning a particular way but be keen to hear fresh opinions.

Thanks in advance.