I am a teacher and when I bought, I went with a June UY. It really works well for my summer and fall travel. Since then, I realized that I like to vacation during Memorial Day as well...not yearly, but every few and June UY would not be a good one. So, I ended up adding on points with a Dec UY. It's two memberships, so takes some juggling, but no big deal.
This always works for my spring and summer travel so I find that either works out well!