The way you've asked, this is just a popularity contest.
Where you are staying and/or the Parks you plan to attend on that day would matter in my suggestion.
Also, going resort-to-resort is not easy on Disney transportation, having your own car (or paying for a taxi) helps.
That being mentioned:
-- Jiko is good, but why go to AKLodge just to eat? And if you are delineating between those in your party who enjoy meat or fish, the 'well-seasoned' food here must agree with everyones palate.
-- Artists Point may be the most consistent place on your list and have a menu that includes the most meat & fish options. Proximity to Magic Kingdom may be 'a good thing' too.
-- We have yet to return to Flying Fish since reopening after a refurbishment and menu changes. While always very good, we simply prefer nearby BlueZoo. Both BlueZoo & Flying fish have at least [3] non-fish entrees available on currently available menus.
http://www.swandolphinrestaurants.com/menus/pdf/bluezoo-dinner.pdf
-- CA Grill - I typically say, "Can be anywhere from magical to disappointing." But brunch seems to be a lovely experience. You may want to consider Narcoossee's as well.
Two recent reviews:
http://www.easywdw.com/easy/blog/review-california-grill-brunch-at-disneys-contemporary-resort/
http://www.easywdw.com/easy/blog/review-narcoossees-sunday-brunch-at-disneys-grand-floridian-resort/
In a vacuum, and looking at just your four [4] selections, I'd suggest Flying Fish for no other reason than the Boardwalk can be a lovely stroll before/after meal.