The issue is your field. If you just had a B.S. and you were doing computer science, I'd say go for startups, but the barriers to entry for biotech firms are much higher. Typically they fund professors and Ph.D's and not undergrads.
Well, if I did go forward with the start-up, I know I'd be able to get PhDs on board (mostly because I am best friends with a few). I'd be happy to do so if it guaranteed funding (I know, but then again, a start-up can never expect to get guaranteed funding). But then again, a lot depends on the product one is trying to sell and the way its pitched, right?
My family is in the biotech/pharma side, and I'm on the computer science side, fyi just to add credibility to my argument.