Why would you have to chose?
If you know women who can write you individual recs, certainly encourage them to do so. The advantage to the personal recs is they can give the chapter more concrete, insightful information.
You should of course sign up with your local alumnae panhellenic, which might result in more recs - but often the local alumnae chapters of the sororities coordinate their rec writing, so it is doubtful you'll end up with 20 XYZ recs, even if you have a relative or friend write one or two. Also, recs go missing, or in the case of the rec written by cousin for me, sent to the wrong school (
).