Who would you rather have?

I was in a doctor's office a little while ago discussing a surgical procedure and my physician suggested I speak to one of his younger colleagues about any new surgical options. The premise was that the younger physician was closest to Med School and the emerging trends and technologies. So, how does this apply to real estate? I'm not going to pretend for a second that buying or selling a home is as risky or complex as surgery, but it does cost a whole lot more money and the money alone carries a big risk if the process is mishandled. So, who would you rather have?

Agent A: Has been in the market for 25 years and has a wonderful network of customers and clients, but does not participate in online marketing of homes or use the latest technology tools to expose a listing to the consumer population or search the detailed online records for their buying clients.

or

Agent B: Has been in the business 3-5 years but has an innate understanding of the technology trends, has the tools to be constantly accessible and can answer any number of questions on the spot with the help of the latest marketplace resources. This agent also uses e-marketing and social networking to help "virally" market your home.

Who would you rather work with, and does it change if you're buying rather than selling?