For a student taking 4 AP courses, and having taken a previous AP science course, I think honors would be the best fit. IME, the honors teacher is typically better and the material is going to be a bit more advanced, but not significantly.
Rigor matters at (at least) many schools, though one course is going to swing the needle very little.
Sorry for the off-topic, but what school is this? I tried the CDS for University of Arizona and Arizona State but they say rigor is Very Important and Important, respectively.