I highly suggest both if you can swing it! I love my traditional textbooks at home and for flipping through when writing a paper. But the digital is so nice too... I can do my reading anywhere, and sometimes even just because I'm tired of holding a heavy book ?
It can also be nice to have the digital when looking for something specific to cite or a rationale for a care plan because I can type key words for a search. I really feel having both has been very helpful!