Is the "National Standard Size" always the most advantageous for rising house prices?

People refer to a supply area of 34 pyeong as the "national standard size."
Is this typically the most advantageous size for house price appreciation??
I have noticed that houses under 20 pyeong don't seem to increase in value much.
But then again, if they are too large, the maintenance fees are extortionate, and outside of Seoul, demand seems low, so prices don't seem to rise much either.