Of AP, IB and dual enrollment AP is by far the worst option. There is a cumulative test at the end of the year where if you do not score high enough you won't receive college credit where as IB and dual enrollment focus on the content of the course throughout the semester to.award credit (and sometimes a cumulative project). Aced your AP class but perform poorly on the test, no credit for you!!! Also the tests cost hundreds of dollars extra. You might ask what does "not scoring high enough entail"? The answer is it is arbitrary. The test is scored 1-5 with 5 being highest and schools pick a range of 3-5 to award credit.