SAT Subject Tests

I’m planning on taking one science subject test along with Math II. I’ve only taken G/T level in Biology and Chemistry. Which subject test would be easier to study for without having taken the AP course?

How did you do in the courses? If about the same, which interests you more, which would make studying easier.

If it’s a complete toss-up, I’ve seen a couple of schools that recommend Chemistry, or Physics/Chemistry, and none that call out Biology. (The vast majority are just “a science”, so this should be a very last tiebreaker.)