Depends on whether you are the seller or the buyer. If you are a buyer and use a credit card through Paypal, it is very secure. Paypal allows you to charge back your money, if you don't get your product. Even if that fails, the same is likely true for your credit card company.
If you are the seller though, PayPal offers little protection against fraudulent chargebacks.
(Haven't used Google Checkout.)
If you are the seller though, PayPal offers little protection against fraudulent chargebacks.
(Haven't used Google Checkout.)