Angel's Tijuana Tacos Food Truck in Santa Ana is the only local place better than Los Cholos. But Los Cholos is still a great spot.
Korean my goto AYCE is Gram's in Garden Grove although Mr. BBQ in Fullerton is also really good.
Ramen Akimoto in Yorba Linda for legit Chicken Paitan Ramen.
Hiro Nori is my goto for Tonkotsu Ramen, Pork Belly Buns and Spicy Tuna Crispy Rice.