I am assuming that your intent is to stay mainly at WDW. If instead you want to mainly stay at VB, HH, GCV or Aulani, you should likely buy at the particular resort. If WDW, consider:
First, seriously consider buying resale. Prices are a lot less than Disney is selling. You give up access to certain Disney collections for trading out to (such as cruise, Disney hotels other than
Disneyland, Adventure vacations) but reality is most don't do those things, the point cost is expensive, and DVD could actually cease offering those to everyone if it felt like doing so.
Second, consider if you want any of the following because for the particular resorts you are very often not going to be able to get them unless you own at the resort and have the 11 month reservation window: (a) BLT standard view; (b) BWV GVs or rooms with standard or boardwalk view, (c) AKV concierge or value rooms; (d) OKW GVs at the Hospitality House area, a booking category (usually OKW GVs are availalble at 7 months elsewhere).
Third, consider time of year you are likely to go. If it is any time between the the Tuesday after Marathon weekend in Jan and about Sep 27, then your main downsides in getting something at 7 months out will often be those mentioned in the the second point above although once in a while you may also have some trouble getting BCV or BLT theme park view during that period at 7 months out. If you instead intend to mainly travel between the end of Sep and the Monday after Marathon Weekend in Jan, then you may also often have problems getting anything at BCV, BWV, or BLT and sometimes even VWL. Moreover, if your intent is to go during the very end of Nov through mid-Dec, or Christmas week, you are likely to find at 7 months out that you are limited to OKW or SSR and possibly AKV standard and savanna view.
Fourth, if in evaluating the above you are considering buying BWV, BCV or VWL to assure getting what you want at 11 months out at one of those, consider another negative. The end date for those resorts is Jan 2042. SSR is 2054, AKL 2057 and BLT 2060; OKW has contracts with 2042 end date and with 2057 end date. 2042 is 29 years away. If you are under 45, and particularly if under 40, that 2042 end date should be considered a real issue. There are many of us who are actually going more often as we get older, such as into the 60s. Thus, that should be a consideration when thinking about purchasing the 2042 end date resorts.
Fifth, weigh in costs in evaluating what you want. In resale, the best bargain is still SSR and its dues are reasonable in comparison to others. If you are fine with SSR when you cannot get elsewhere at 7 months out, you should definitely consider it. BLT has the lowest dues per point but its sale price per point is high. Hilton Head and Vero are less in price than any others but dues are high, a pattern likely to continue when you are dealing with two resorts that have high dues for a variety of factors including being close to salt (corrosive) air from the sea and being in hurricane zones. AKL is currently somewhat more expensive than SSR and its dues are likely to remain higher than SSR but it is also a consideration other than SSR if you want to capture the possiblity of getting concierge or value rooms.