Definitely get a VISA. They are more easily accepted online than MasterCard. When CitiBank switched my Driver's Edge to a MasterCard, I had so many problems buying online I made them switch me back to a VISA.

Otherwise, the difference is not significant.

Brad "Diva": 2004 Mazda 6s 5-door, Volcanic Red Rex: 1988 Mazda RX-7 Vert, Harbor Blue.