USABO/ AP Bio or Chem dilemma

Hey guys,
I a rising sophomore and am debating if I should take AP bio or AP chem. This summer I am self studying academic chem and it is going quite well. But I also have ambitions to make USABO camp junior year. I simply do not know bio or Chem will be a better choice sophomore year.

If I take bio, then Chem will be very difficult junior year considering that I self studied a year before and that I will need to prepare for ACT/SAT.

If I take Chem, then I risk sacrificing a year for solely USABO preparation. ( btw, I plan to alot 2 hours a day for USABO either way)

ANY advice will be greatly appreciated. Thank you