Which is best? AP, CLEP, or community college? It probably depends on who you ask. Each college will have their own unique policy for each option. One college may accept AP and not community college. One may accept CLEP by not AP. Colleges are unique in every way, but they are "frustratingly unique" when it comes to admission, placement, and transfer credits with AP, CLEP, and Community College courses.
You can be prepared by learning about your first choice universities, and find out what they want. Do they prefer CLEP or AP? Will they take community college credit - especially credits taken at YOUR community college? In some situations, like applying to highly selective schools, they may not accept community college courses for transfer credit or class placement. So in some situations, it may be a good idea to get BOTH kinds of proof for college level study. But the only way to know for sure is to check with the colleges where they plan to apply.
You will have to provide a transcript from the community college even if they do not accept the college credits.
I wish I could give an absolute "right" answer to which is best, but "it depends" is the best I can do!