I would like to know which AMEX Business cards allow you to carry a balance.
Every Amex Biz CC except the Platinum, Gold, or Green charge cards.
I would probably stick with BBC or the BBP, as they offer 0% APR promos from 12-15 months depending on the offer.
The others do not, or very rarely do. They also have a lower standard APR after the promo ends, than the cobranded cards. At least mine were.