Naniwa Chosera 400 or 600

[Richard78]

What grid would you pick as a coarse stone in between the following stones?
I allready have an Atoma 140 and a Naniwa Chosera 1000 and a Bester 1200.
Is the difference noticeable between the 400 and 600 Chosera?

The Professional stones that replaced the Choseras are that the exact same stones but thinner?

 

[berko]

take the 600 for cheap as long as its available.

 

[Richard78]

take the 600 for cheap as long as its available.

The discount on that website is the exact reason I asked this question:biggrin:
The 400 is also on discount but that one is the Professional version.
I wondered what is the best stone to combine with my 1000 Chosera, price is a little bit less important.
If the 400 is a better stone I prefer to buy that one.