Should I take AP Physics B or On-Level?

I am a rising junior and do not know if I should take AP Physics B or On-Level Physics next year (they do not offer honors at my school). I have never taken a physics course before and I will be also taking pre-calculus. I have a busy schedule (practice afterschool and lots of homework from other APs and volunteering), so I do not know if I have time for the workload. Is it difficult and would I need lots of time to study/do homework? I want a challenge, but not a very stressful schedule.