Visa Inc V and Mastercard Inc MA may be the titans of payments, but their trajectories diverge sharply.Which one should investors put their chips on?Visa: A Steady Hand Amid VolatilityVisa's second-quarter results came in with little drama; investors are here for it. While some expected a slowdown, Visa delivered with solid numbers, beating both revenue and EPS estimates. Cross-border volumes were up 13%, and domestic volumes were up 5.9%. Even with a slight deceleration in growth, the results indicate the ...