It can certainly help build a credit score, but remember that businesses gain credit differently from individuals. Depending on the country, there isn't usually a national register of business credit ratings the way there is for individuals. The credit record you'd be gaining is with your own bank only.
Banks will usually base your business credit record on revenue and transactional loads rather than merely on having and holding a credit card. That said, it isn't always that easy to get a business credit card and so it is a useful thing to have for credibility with clients (depending on the type of work you do).
A credit card can also sometimes work out cheaper (and faster) for financing small overdrafts than a regular business overdraft facility. That said, I've found that larger loans over a five-year term can work out much cheaper for an established business than they would for an individual, even where the business itself has no history of using credit.