If you can change it, then town that never sleeps during the summer because I can stay up as late as I want with no school. Then, probably beautiful or rich during the other months, depending which lets me manage my town best with the little time I have during the school year.
If you can't change it, then I guess beautiful if it lets trees grow faster. I'm mostly interested in obtaining all the fruit trees, especially since quite a few new fruits have been added. If beautiful just means something like it's easier to get a perfect town, then I'll choose none of them.
I'm already leaning towards beautiful, but if trees grow faster then that will automatically become my choice. :3