Which credit card do you use most?

We use our American Airlines M/C on EVERYTHING, it gets paid in full every month as well.
The only place I don't use it is Neiman's, I use my NM card there.
 
Amex gold for small purchases (have to pay it off every month)
debit for everyday purchases
AmexBlue & Discover for big stuff

Hubby uses his Best Buy card ALL the time lol....I cut up Macys several years ago and just paid off Banana Republic...thinking of a Saks or Bloomies card.
 
I use my debit for things I don't think my DH should pay for or see (ie gifts for him) and a MC for everything else to get mileage. I do have an American blue...can anyone tell me the difference between all the colors? TIA.
 
I put everything on my USairways Visa Signature card to get miles and b/c that level lets me board early and get upgrades. Unfortunately, usair is sort of going down the tubes, but it's the main airline in my small town, so I'm all about their dividend miles program.