I have a few amex cards and love them
Some for biz and some personal.. Amex in my opinion has about the best customer service of any "prime" credit card lender out there. Also once you have a relationship with Amex "cli" (credit line increases) are easy. As a matter of fact, login, goto services and hit CLI, usually you can get one instantly, if you get a form to fill out, decide if you really want one, as it will pull a hard on your cr's.
on one biz and one personal Amex (credit card not charge) I went from like 5k line in 94 to over 125k each, but it did take 11 yrs or so.
One thing to always remember with Amex, they do FR's (financial reviews) on customers sometimes. The easiest way to trigger a FR is to have 1 or more Charge Cards and 1 or more Credit Cards. If you get credit cards and have a charge card and not for biz, and don't really need it, close it..