I preferr PayPal, but have tried AlertPay and Moneybookers also. It definately helps to increase sales the more payment solutions you provide your clients with. The people that will not use PayPal, will probably use AlertPay and vise versa.
Accepting credit cards directly from your website will also increase your sales, as most people want to actually give you their credit card info to pay.
We are using 2Checkout and to be honest we prefer 2checkout, but we also have Alertpay, PayPal and Banktransfer. 2Checkout and Alertpay are great because they pay directly to our credit card. also there are less chargebacks at 2CO than on other payment gateways.
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I offer paypal only for right now cause its very convenient. I have considered and will continue to think about getting more payment options. But currently paypal is the easiest. The next thing I might get is google checkout.