Board Thread:Question and Answer/@comment-25874611-20150222045322/@comment-6477627-20150222054329

IMO, the points gained in later areas battles raises in proporition to the vitality increase in later areas. However, the blank steps, AW encounter and other steps where you don't get progress points in the later areas means that you'll be wasting more vitality for points overall in the later areas.

Still, if you're going for a lot of points then I'd do it in the later areas because it is a huge time saver.