lol I wouldn't say that; you definitely possess "high" intelligence. Also remember, it takes MOST people multiple attempts to get a "good" enough score.
Not sure if they overlap a lot. However, you'll be studying MORE subjects to have a firm grasp of the material before taking both tests. MCAT has physics, gchem, ochem, verbal, writing, and bio sections. DAT has math, bio (larger scope), gchem, ochem (need to know alkene/aromatic series), reading comp, and PAT (which can take a few weeks to a few months of preparation to fully understand rules of the section). It's tougher to study for both compared to one of them.
To the OP: Therefore, just choose one, and hope to do well in it!!! It's not worth the hassle or confusion. It complicates things. I'm just trying to save your sanity.
Good luck.👍