I wouldn't necessarily say IB is harder then AP, but it does require much more vs AP. IB is much more work intensive and because you have to take certain classes to get the diploma over AP. Becuase of that, you get much more hw plus CAS and EE/TOK. It also emphasizes more group work then AP and since you have a class for two years vs one, you can't just kinda learn the subject then forget it. Everything you learn is tested for at the end of your senior year. Friends of mine that got out of IB say that they have much less stress and hw. Like someone said earlier, IB requires a more anyalitical type thinking and goes more in depth in a subject. Because I can only take 3-4 HL classes, I'm probably going to do the Subject Tests for the classes that are SL to maybe get credit for it. That is a major downside of IB beyond the work load. And at the OP, just because your opinion that AP is "clearly better" is a bit presumptuous, there are both disadvantages and advantages to AP and IB.