I have Amex because I trust them most to be on _my_ side instead of the merchants side by default. It's not accepted everywhere though. I use this preferentially anywhere its accepted that seems even the slightest bit sketchy.
I have both a Visa and a MasterCard - each from different banks, because I've been caught out when one bank's network is down and I couldn't pay for stuff or withdraw cash while travelling. I've never experienced a failure of ether Visa or Mastercards backends, but when I decided I needed a second source of credit/debit card at a seperate bank, I figured I may as well make sure I have one of each.
I have debit cards because they're pretty much an automatic part of having an account and a credit card, and also because I keep the credit limits on my cards low intentionally, and can use a debit card or online banking savings account with a much higher daily limit for large purchases.
I have one extra "single purpose" Visa card with a high credit limit and that gets used exclusively for my Apple/Google/AWS/Linode/DigitalOcean accounts. This is for peace of mind that my AppStore/GooglePlay accounts and my hosting accounts will _always_ charge successfully - the credit limit is over 10 times my total monthly spend over those accounts, I could conceivably vanish for a whole year and those would still all get automatically paid.
I have Amex because I trust them most to be on _my_ side instead of the merchants side by default. It's not accepted everywhere though. I use this preferentially anywhere its accepted that seems even the slightest bit sketchy.
I have both a Visa and a MasterCard - each from different banks, because I've been caught out when one bank's network is down and I couldn't pay for stuff or withdraw cash while travelling. I've never experienced a failure of ether Visa or Mastercards backends, but when I decided I needed a second source of credit/debit card at a seperate bank, I figured I may as well make sure I have one of each.
I have debit cards because they're pretty much an automatic part of having an account and a credit card, and also because I keep the credit limits on my cards low intentionally, and can use a debit card or online banking savings account with a much higher daily limit for large purchases.
I have one extra "single purpose" Visa card with a high credit limit and that gets used exclusively for my Apple/Google/AWS/Linode/DigitalOcean accounts. This is for peace of mind that my AppStore/GooglePlay accounts and my hosting accounts will _always_ charge successfully - the credit limit is over 10 times my total monthly spend over those accounts, I could conceivably vanish for a whole year and those would still all get automatically paid.