Even in the low income areas of 'Berdoo In-N-Out attracts customers like a magnet, which is honestly fairly surprising considering their prices. We go there
maybe three or four times a year - Del Taco on the other hand, I visit two or three times a month
As for what the best fast food burger is - I'm inclined to say Carl's Jr (aka Hardee's) but I usually get a chicken sandwich there when I'm over in Riverside every week. Places like McDonald's and Jack in the Box are what they are; definitely not the best, but I don't go there expecting a five star meal. Overall I'm gonna give the "best fast food burger" reward to a local place called George's Burgers - their burgers taste really good, and their combos are a literal box filled with fries and onion rings (don't forget the drink)! Priced fairly reasonably too, especially considering the amount of food they give you.