In lots of sentences it won't issue if "best" or "the best" is applied. To my ear, "best" By itself tends to sound superior, but Which might be due to way my spouse and children spoke as I had been increasing up. Nonetheless, sometimes grammar demands one or the other. https://remingtonvlgdx.bloguetechno.com/the-2-minute-rule-for-case-study-help-74353939