UC-certified honors, AP/IB, and transferable college courses are equally meritorious in the sense that they are all challenging courses, and they all add extra weight to an applicant's GPA.
The benefit of an AP/IB course is that it is part of a nationally standardized program culminating in an exam that, if passed, can earn college credit. Similarly, satisfactory grades received in transferable college courses will also earn credit at UCLA. High school honors courses, in contrast, will not earn college credit. If you are still in high school and are interested in completing college courses, you can access a list of UC-transferable courses offered at California community colleges at www.assist.org.
*Information obtained from University of California, Los Angeles official website*