I switched back to Amex despite them offering worse rewards than my other card because of this. Other card: I returned an item, with proof of delivery via UPS

I switched back to Amex despite them offering worse rewards than my other card because of this. Other card: I returned an item, with proof of delivery via UPS tracking. Never got a refund. Opened a dispute. Weeks later, the dispute was resolved in the merchant's favor despite the merchant providing nothing as evidence except the original receipt. I had to call the help line, deal with several uncomprehending service reps until one of them re-opened the dispute, asking me to resubmit the same documents I submitted the first time! Finally the dispute was resolved in my favor a month later. Amex: I ordered some items from a local store to be delivered and the order was cancelled without my money being refunded. I received an email with a few questions, which I answered. A few weeks later the dispute was resolved in my favor. I still need to carry another card because some merchants don't accept Amex, but I use the Amex for everything I possibly can. I'm giving up some cash back rewards to do so, and I'm also paying an annual fee, but that's a small price to pay for getting better service when something goes wrong.