Visa is any day a better option as Visa is larger. To get into details both cards are accepted worldwide but there are still a few places where Visa is accepted more than a Master card but Master card is close on its heels.
Master card is like the next best option. Both the cards offer non bank perks like fraud protection, purchase protection, product warranty extension and travel insurance etc. however Visa is a little better. Visa has better "loss of use" coverage on car rental insurance. It also offers return protection broadly.
That said let me tell you that neither Visa nor MasterCard actually issue any credit cards on their own. They are both simply methods of payment.The fact is that the bank/financial institution that determines what interest rates and rewards programs to offer. Visa and Master have nothing to do with your rewards programs, interest rates, late fees or customer service issues. Instead, they make money by processing transactions between your point of purchase and your bank.
Both Visa and MasterCard are nothing but merchant processing systems.Simply put, they are payment networks that connect merchant payment terminals with your bank’s credit card department.