<p>It doesn't seem as if very many people are interested in giving you a legitimate answer to your question.</p>
<p>I would say you should do Academic Decathlon, definitely. To the poster who was surprised that AD is a class at your school, I would tell you that there doesn't have to be a class, but if there isn't one, the team won't be any good. It's important to be in the class in order to do well. I would know; I got the top score in the Texas state competition last year (8780 or so [it was a tough year]). Colleges want to see involvement in extracurricular activities, and I think that would be more impressive, especially if you do well, than just taking one more AP class. However, I urge you to do both. The computer science tests don't cover a lot of material, so I think you could easily study for one on your own. It's possible to study for AP tests and do AD at the same time. Again, I would know, I took 9 last year.</p>
<p>So if you really want to challenge yourself and accomplish a lot, you should take the AD class and study for the CS test on your own. However, if that doesn't seem pleasant to you, I would definitely pick AD over CS. Besides, the AD competitions are a lot of fun, unlike a computer science class.</p>