Just in case you're talking about descriptivism vs. prescriptivism.

I'm a descriptivist. I don't believe language should have arbitrary rules, like which kinds of words you're allowed to end a sentence with.

However, to be an honest descriptivist, you must acknowledge that words are used in certain ways more frequently than others. Definitions attempt to capture the canonical usage of a word.

Therefore, if you want to communicate clearly, you should use words the way they are commonly understood to be used.