I agree with Riverkid and Casiopea - it's a wrong question. One does not exclude the other. The question is a fallacy which I ,unfortunately, can't define (contradictory premises?).
Which is better? Agreed; this is the wrong question. It assumes the premise that one is better, yet the answer is subjective.
Which do I prefer? I am a strict prescriptivist. Surely English is destined therefore, to breath and grow; but I find the grammatical pendulum all the way to the left. I believe many people find descriptivism a convenient shade from the need to learn rules. They know most of them, so the rest really don't matter. They are fringe rules anyway.
This is also a loaded question. I can not think of a single source, including prescriptive grammars, written according to prescription from cover to cover, which is really too bad.
Communication is made possible by prescription. Variations in usage are inevitable. Now ask what kind of change are we talking about?
Functional shift is very useful. The noun
paint as a verb
to paint facilitates communication, and breaks no rule. Neologisms are the basis of any language. They offer a way of expressing an idea, enriching the language. Neologisms break no rules. Prescriptive errors typically degrade the language, and confuse meaning, hindering clarity, and sometimes breaking rules. Allowing
infer to mean
imply is pointless. It is an incestuous relationship, but can be found in descriptive dictionaries.
People say "to coin a phrase" when they mean "to cite a phrase." You can defend this under the umbrella of "usage," but it would be a waste of a perfectly good language.
I would like to read one book where the author and editor created a grammatically correct document just so I would have a model. That way, I wouldn't have to figure out what the author meant by context due to style.
Also, being grammatically correct does not mean formal English. I would like to preserve the subjunctive mood even if using colloquial slang. A book written this way would be a joy.
By the way, hi everyone. I'm Tuco! I didn't introduce myself in an introductory forum.