So, I guess that if the 5980 is a big watch for you, the same goes for the 5711.
I would go for the 5980, without any hesitation. First, I don't like the thick and large mluminova indexes on the 5711.
Then, the monocounter on the 5980 is superb, and so original.
I would also add that the 5980 movement is the first in house automatic Chrono movement.
I would end with the character of the 5980, which is faithful to the roots of the Nautilus: Sport Chic, at the Top.
Best,
Nicolas.