Click on the criterion for an easy explanation. This determines how widely is the card accepted. It depends on the network and the affiliation. For instance, Visa and Master Cards are more widely accepted than Diners or American Express. Also, a global card scores higher on acceptability than a domestic one.
All cards have basic minimum income criterion for issuing cards.
Fees One of the most important factors, the fees include joining fees, annual subscription and fees for add on cards. All these fees are billed in the first bill and are not charged upfront. Its always better to pay on time. Otherwise you pay charges for late payment. These are only in case you do not pay the minimum required amount.