<p>Stanford prefers Math2. Most Engineering and Science program do too.
Math2 covers more materials, however, it also has a much more generous curve. So at the end, one may get higher score in Math2 than Math1. You should try a couple practice tests on both and see which one you may score better. For Math2, you may skip 6-7 questions and still get 800. For Math1, you may need to get almost all correct answers for 800.</p>