<prompt> Human: Is it advantageous to have a DiscoverAMEX card ONLY because it is not a VisaMastercard? Im not sure if diversity in payment networks outside VisaMC matters.My only thought was to get an AMEX for their superior customer support from what Ive read.  <response>: I would get a Visa or a Mastercard if you only had Discover and Amex, but not the other way around. 