There’s definitely a big difference between good and best. It is safe to say that most design companies fall under the good category but it takes some special ingredients to fall under the best category.
There are two questions that should come to mind while searching for the best web design agencies.
One, how long have they operated as an agency? Are they established or a startup? Now, there’s nothing wrong with working with start-ups because sometimes you need disruptors. However, ensure that even though they are a startup, their portfolio of client work shows excellence and creativity.