With Capital One (COF)  recently reporting strong Q2 results, investors will be looking forward to Visa’s (V Quick Quote - Free Report)  and Mastercard's (MA Quick Quote - Free Report)  quarterly reports next week on Tuesday, July 29, and Thursday, July 31, respectively.While Capital One’s focus is on consumer and commercial lending, Mastercard and Visa are two of the leading payment solution providers, making it an interesting topic of which of these credit card giants may be the better investment as earni ...