Quote:
Originally Posted by
GreenFrog 
...Otherwise I use my Fidelity Visa card to get 1.5 points per purchase and get cash rewards deposited in my brokerage account. To me, the higher tier Amex cards don't make sense.
Fidelity does an AMEX as well that has 2% cash back into your Fidelity brokerage. Honestly, it's one of the best cards out there as far as pure benefit goes. Redeeming points often involves hidden fees, blackout items / dates, etc., and no matter what you're better off with cash than gift cards. For the Fidelity card, you only need a Fidelity account and you get 2% cash back on everything (gas, groceries, clothes...whatever) and has no annual fee (unlike many AMEX cards). Some people may prefer the frivolousness of getting free hotel rooms or knick knacks from a catalog, but from a purely financial perspective this card is very hard to beat.
Also, OP was wondering what distinguishes AMEX. AMEX was originally a charge card, not really a "credit card" in the sense of how we think about it now. It was basically a line of credit which needed to be paid off in full every month. There are still AMEX accounts out there that need to be paid in full every month, so I think a lot of the assumption is that the people that have them are liquid, reputable clients / customers who can actually afford the stuff they are buying (or their company can, at least). This lends some credibility to cardholders.