Customers can use their credit card or bank account (where available) with paypal even if they don’t have an account with them. Paypal is a safe and secure way for your customers to make purchases online. I use paypal on ebay and for all other online shopping. I also use it for my online websites.

Another great one to try is 2checkout, I have used them as a customer but have not yet added them to my websites.

Hope that helps to answer your question.

PayPal, unless you’re going to be doing really high volume.