Because these 4 Chronos are claimed by their respective brands to belong to the category of fine Chronos.
And I believe this is a fact that they all 4 belong to this category.
BUT on all points, aesthetical or mechanical, there is no neat winner, IMO.
I also strongly believe that JLC, these past years, has a very strong place among the top ... ( I don't know if I have to say 3, 4, 5 or more ) Manufactures.
The Duometre is certainly one of the most speaking example.
Best, my friend.
Nicolas