That depends on your financing requirements, risk profile, and personal preferences. For example, credit cards may have higher interest rates, but they may also be a quicker source of financing than an overdraft facility (which may not even be accessible depending on your risk profile, business plan, collateral, etc.)
Apart from credit cards and overdraft facilities, there are many other sources of debt funding (e.g. SEFA, NEF, NYDA). And, of course, there are many sources of non-debt financing (e.g. grants, equity, mezzanine, crowdfunding).