I think Bootcamp is the best practice for the real DAT even though it's more difficult in most sections because it lets you get good enough at the straightforward sections to have more time for the harder ones. Section by section:
Keyholes: might have had a hard version on my test but they were INSANELY difficult, much harder than even Bootcamp, and used crazy objects.
TFE: difficulty on par with Bootcamp and CrackDAT, but Bootcamp has better explanations.
Angles: on par with CrackDAT, much easier than anything on Bootcamp. Bootcamp was overkill in this section, the real deal was actually pretty easy.
Hole Punching: I couldn't figure out where they punched the hole on a few of these, but aside from that, this section is pretty much the same across all resources.
Cube Counting: difficulty on par with Bootcamp. CrackDAT likes to mess with illusions that don't actually show up on the real thing in this section.
Pattern Folding: about on par with CrackDAT. Bootcamp is a lot harder but I would say more useful towards practice because the explanations are significantly better.