Out of the 3 listed I find myself leaning Wendy's these days. Never been a fan of McDonalds and don't mind Burger King, but I find myself always being satisfied when going to Wendy's
That said, I'm also partial to Seattle's local burger chain, Dick's! Nothing beats a bag of Dick's, especially late night after a concert
Or if I want an actual good cheese burger, then I prefer to just go to a proper restaurant.