You can't go wrong either way!!!!! You shouldn't limit yourself to one.
A native Angelino I grew up on Fatburger, and just recently came to understand the gospel of INO.
Cable vs Sat
BMW vs Mercedes Benz
Your good either way.
But to get off of the fence taste of meal only I will cast my vote for Fatburger - I love the fat fries and the extra sweet Ketchup - breaks the tie for me.
But for Value, quick and consisitent service - INO
There is a great degree of variation in Fatburger which can disappoint, and many of the locations were closed on my last four trips to LA in 2005.
Although I was surprised that the Fatburger in Jersey City, NJ isn't very far off the mark.
Maps