For content review and learning of materials I used Bootcamp + Anki. Once I was done with all topics (meaning I'd memorized the 500 page bio academy notes, all ochem reactions and nuances, gen chem problem, and PAT), I started doing practice tests on Booster and made sure to understand every single question and why it was wrong or why I got it right. Then I started the Bootcamp full length tests (SAVE ALL "SUBJECT TESTS" UNTIL THE END, they get recycled in the full-lengths) and did the same thing I was doing with Booster exams. I highly recommend using both resources but buy Booster once you're done with content review on Bootcamp, since it's mainly best for practice exams whereas Bootcamp has practice problems as you go through each chapter in addition to their exams. As far as similarity to the real DAT, I'd say Booster was the most representative for the sciences (I had multiple questions on bio that were nearly identical to questions I'd seen on Booster), but Bootcamp's PAT tests are much more like the real thing. I'm not sure why PAT Booster gets so much praise, to me it felt much easier than the real test as well as than Bootcamp's tests.
Long story short, start with Bootcamp, finish the content, then buy Booster to have more practice exams in addition to Bootcamp's exams.