Does it matter if I use my personal or business credit card when making purchases for my business?

It does not matter which credit card you use. You are the director of your company, which entitles you to use whichever credit card you feel you are getting a better deal with. If you use your personal credit card to pay for business expenses the corporation owes you the amount and vice versa.  However, it is highly recommend that you do your best not to intertwine  personal expenses and business expenses.  If you choose to use a personal credit card for business use it exclusively for business and put your personal non deductible expenses on another credit card.