Entering a rebuild I'd say prioritize defensive prospects over offensive ones.
Unless you're getting a true star, the defensive prospect is going to be much more valuable, and much cheaper long term.
E.g. I'd rather have a guy like Kawhi Leonard than Eric Gordon.
The playoffs show us year after year that putting together a team capable of playing great defense will take you far even if your offense kind of sucks. Defensive players tend to make less money, and it's easier to get players in the draft who can play really tenacious defense (see: Bradley, Avery).
I mean, just look at what Indiana has done. They've prioritized drafting defensive guys over offensive ones (by and large), and though their team is pretty hapless offensively, they made it to Game 7 of the Conference Finals against the defending champions because they were so good defensively (and on the boards).