First, I recommend that you also talk to you doctor if you are serious about weight loss. Weight loss is a serious endeavor and is best done under medical supervision.

That being said, I'm coming down on the side of Alli. Here's why.

For starters, Alli is FDA approved, and Acai Burn is not.

This doesn't necessarily mean one is better or safer than the other. It means that Alli had to go through a testing and approval process that Acai did not.

In fact, they are in two different categories. Alli is a medication, like Advil or Zyrtec. Alli is Orlistat, a medical drug that doctors prescribe, to treat obesity. Alli is simply a lower dose of this drug for over the counter use.

Acai Burn is a nutritional supplement.

This means that Alli can make claims about weight loss that are backed up by research and data.

Acai Burn cannot make those claims because it has not undergone the same testing. It is only legally allowed to make "structure and function" claims that are very vague and do not give accurate information (e.g. brainbrush's "may promote" and "may help.") I am personally VERY skeptical of Acai Burn's claims that it helps you lose 450% more weight. I'd contact the company and ask for their clinical studies, and see if they give them to you.

In fact, Alli's mechanism for working is well-known, and freely reported on the FDA's Web site. It works by preventing your body from absorbing some of the fat in what you eat. So, basically, you get fewer calories from what you eat. This also means that you get fewer nutrients possibly, which is why the FDA recommends that you take a multivitamin while on Alli and to watch the amount of fat you eat. The FDA also says that Alli should NOT be used without making fundamental changes to lifestyle and diet. That's why it's sold with a book that discusses the diet plan. Alli is the drug + the lifestyle change.
Source(s):
http://www.fda.gov/Cder/drug/infopage/orlistat_otc/index.htm

http://www.fda.gov/bbs/topics/NEWS/2007/new01557.html

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