Recommendations for the best credit card providers for SMB or other options to consider?

A small company that we are in the process to acquire uses one of the current executives name/account for company credit cards. A number of key managers have a card to pay for certain day-to-day operating expenses. We will be switching to a new credit card company for multiple reasons including the current exec is retiring and the account should be in the company's name.

Any recommendations for vendors that are great to work with for SMB? Low fees, multiple users, fraud prevention/ support, and attractive cash-back rewards or other points that are of high value.

For petty cash items, or sometimes equipment or fuel are there any other good purchasing solutions that are flexible and secure besides credit cards?

Thanks in advance for your consideration.