If you look at the Platinum cards, Visa or Mastercard. As a whole Mastercard has a better offering regardless of card providor. Plus Mastercard has a Global Service that can help you with most basic queries world wide.
Visa is trying desperatly at present to catch up some of the business it has lost over the last few years. In my view Mastercard is just that bit more accessiable at present.
From just $6 we'll remove all advertisements so that you can enjoy a cleaner and uninterupted viewing experience.And you'll be supporting us so that we can continue to provide this valuable resource :)