I can't say much about either of the two resources, but before you begin studying that you really need to get a good foundation for the material covered on the DAT. Just jumping in and taking practice tests straight off the bat will not accomplish that, and you will likely miss really important concepts that could very well show up on your exam because no two exams are alike. I felt like the Destroyers+videos really did that the best for me, personally, and many others. Regardless of what resource you use, it's critical that you do this. Find what works best for you, and don't forget to challenge yourself a little more than you usually would when studying for this exam! A resource can't really be too hard, because it's hard to overprepare for such an important exam.
Best of luck! 🙂