Since Los Angeles is the largest consumer city of hot dogs in the US, followed by New York, San Antonio, and Chicago, we have a pretty good perspective on the hot dog.
I love both Nathan's and Vienna Beef, along with Hebrew National and Farmer John's.
Nathan's tastes best with NY deli style mustard, or "almost naked." Yeah, you can make it Coney Island style, but it kind of drowns the dog.
Vienna Beef really is best when you "drag it through the garden." Just don't over do it. When the ingredients are put on in the right amounts, there's no better dog on the planet.
Hebrew National loves some spicy mustard, a dill slice, and some onion--ooh, heaven.
Give me a Farmer John's with some mustard, onions, relish, and a couple of Jalapenos at an LA Galaxy game, and I'm good for 90 minutes.
The local dog chain, Weinerschnitzel, actually does a Chicago Dog that's not half bad, but it's not Vienna Beef, and they can drown the dog, so you gotta scrape some off. They also make a Stadium Dog that's overrated and they built a rep on chili dogs and their "chili dog diet," which in a sick way is kind of funny.
Let's face it, good dogs is good anywhere, and NO Ketchup, please!