If you want a specific resort, you should buy there typically. The small resorts get filled up quicker in general, especially the studios. If you don't care where you stay and just want "1-bedrooms and occasional 2-bedrooms stays, including cabins" and figure you'll often book at 7 months, I would say total number of points is more important.
Keep in mind that every room fills up eventually as you get closer to the date you plan to go. But I generally have had no problems booking at 7 months since I'm flexible about where I stay, and don't mind going to any available resort. Most of the points I have bought are SAPs (Sleep Around Points), meaning I bought them because they were cheap and will often use them in the 7 month window for whatever resort I want and can get.