I liked Braddom. I thought it was easily readable and gave a nice basis for a number of topics in PMR that you will see. I never looked through DeLisa so can't comment. Braddom has an online component that I didn't use, though some people I know liked it.
I would check with your program about funding for books. When I started my G2 year we got "x" amount for books/educational material. A new copy of Braddom or Delisa is going to be expensive for most residents. Thus if you can get an advance or have them pay earlier for it that would be nice. Also if your intern place has a medical library there is a small chance they might have a copy, or if PMR is at your internship there may be an attending that would let you copy chapters for studying, thus you could wait to make the purchase when the program will pony up for it, and when there might be a new edition/other book available.
You might want to consider just reading the "essential articles in PMR" that are floating around. I think there is a sticky here, and you can grab them from the AAP website. Most of the texts are based on articles anyway. Braddom and DeLisa are a bit bulky to lug around, thus throwing pdfs of the essential articles on to your phone/reader/email can be a bit easier.