I must be naive in thinking that only people who had tried BOTH In-n-Out and 5 Guys would be able to give a qualified answer to the question in this post.
IMHO both are good but salty. Animal Style is preferred but sloppy for In-n-Out. Since the 5 Guys here has no drive through, I like the option of calling in my order to reduce waiting time. Burgers and fries are greasy and their fries have skins. In-n-out preferred for value and taste.
In-n-Out, unless I'm in Orange County and The Hat is nearby. Then I would have to think about it a bit. I can't go to The Hat without at least three friends to split fries and rings with and not feel really guilty later.
Make mine a Double Double, Animal Style, no pickles. Fries and a soda.