I wouldn't really go with either. There are better sets out there now.
For fundamentals in grappling I'd start with Roy Dean BJJ Blue Belt Requirements and No Gi Essentials. There's a lot to be said, particularly for a beginner of learning from someone who is clear and articulate in the language of insruction. Roy Harris is also good, but he speaks so quietly that it's somewhat hard to understand him still.
If you're going more advanced, Luis Gutierrez's So Flo series is great, and again the advantage of having someone who's articulate and expressive in the language of instruction is obvious.
While that only covers grappling, if you're considerring Sperry that covers you just as well, and it's generally best to get instruction from people who are experts in their particular area.
For Boxing, Rodney King's Crazy Monkey and Quantum Boxing series are great, although while it's targetted at beginners, he talks more like Gutierrez and it takes some getting used to his South African accent. I haven't come across anyone who's as clear and articulate as Roy Dean, particularly for basics, when it comes to striking.
I haven't seen Bas' DVDs of combat, but the impression I get is they're just a massive collection of techniques, and where Bas really is best is actually with his workout tapes. Sperry has a good selection of information, and before Roy Harris, Michael Jen and Roy Dean were on the scene it was actually pretty good, but there's simply newer stuff now that's better to get.