Just realized there was a second component to your question. I think it's a wash. Anecdotally, I have 2 sons who chose to go to different schools, one doing AP, the other IB. I think both are legit choices, and you have to try to figure out which most matches your kid's learning style and goals. IB is more of a multi-discipline style of learning and process oriented. AP is more goal oriented. Teachers are often accused of "teaching to the test". Well duh, passing the AP tests are the stated goal of the courses.
Most IB schools do presentations about the program, so attending one of those would be good start. They also all have an IB admin who keeps watch over the progress of the students toward their diplomas. At least in a public school AP is going to be be more of a DIY process.
If you think you may use a private college councillor down the road and it's in your budget, you could get a meeting to talk about how well the students at each school have done with college admissions. Also see if the schools publish a list of where their grads are headed each year.
I've heard quite a few college admissions people address this general question and all I've ever heard them say is that they respect both equally.
So you probably can't go wrong. In our case, overall the IB school places fewer kids at top schools than the AP school, but that's more a function of the overall demographics than anything else.