I personally do not think any one company has the best MCAT review materials. One company may have the best physics, while another has the best chemistry and so on. I fear putting up an opinion, because I can't believe how personal many of the people here take the comments about courses. Never the less, here's my $0.02.
I have tutored (privately and for two different companies) for a few years and seen most all of the materials. I think the best general chemistry by far is from Berkeley Review. It has both the best passages and the a solid conceptual review. It is the only book I've seen that emphasizes how to think about the material rather than just listing paragraphs of information. If you have the time to absorb the material, you will be happy with what you get. If you don't have a few months to digest it, don't get it.