I had weird issues in South America where (say) Visa was accepted, but MasterCard wasn't. As a(n) (North-)American, i've always considered the 2 as precisely eq

I had weird issues in South America where (say) Visa was accepted, but MasterCard wasn't. As a(n) (North-)American, i've always considered the 2 as precisely equal because the processors that handle one always seem to handle the other. The only question is only ever whether Amex or Discover is accepted.