One thing I want to mention based on the OP’s OP…don’t think that just because a school does not offer IB program that it is any less rigorous. Also, note that some schools don’t really do the AP thing because they don’t believe in “teaching to the test” but can offer a similar amount of rigor…and by and large the college admissions people know what’s up.
My daughter initially planned to do the full IB (which starts Junior year) but opted out when she realized that it would mean taking a subject she had already taken at her previous high school, where IIRC, it was handled as a two-year class. While I am a fan of IB, it can be restricting.