Gentleman, they both have experience. However, the question is to what degree are you comfortable with, a) the breadth of experience of one; and b) the type of experience of another. The argument here is not whether one has enough experience to be president, but whether that experience is enough for you to cast a vote in that direction.
IMO, the arguement about experience is mistaken. Obviously you want to see some minimum level of experience as a baseline. But after that, it is not clear that more experience produces better results.
I consider things like capability, decision making style, decision making values, emotional stability.
Capability
McCAin> Bottom 5 at
Airforce Naval Academy
Obama> Editor Harvard Law review
Decision making style
McCAin> Quick, gut decisions, high risk
Obama> Analyitcal, controlled risk
Decision making values
McCAin> Free market is prime value
Obama> General welfare is prime value
Emotional stability
McCAin> A bit of a hot head
Obama> Cool and deliberate