I see that PayPal and Moneybookers are very similar in nature. I'm setting up a new website, and I need to include an online payment method that has the highest popularity internationally; targeting such countries in Asia, Europe, Africa, Australia/Oceania, etc...
Which payment method do you believe has a better worldwide presence and usage rate with international users?
Well, the truth is you would be well advised to accept all forms of payment - online or offline. Customers have different preferences and the more ways you can accept money the better chance you have of accepting any customer payment, and your customer may be happier because you support their preferred form of payment. Which also makes it easier for them to return to you again ... and again.
I have customers to put cash or cheques in the post, others pay by Visa or Mastercard but I have never had anybody wish to pay with a direct transfer from a Paypal account. Unless there is something specific about your market that requires this I would simply consider PP as one of many possible card processors.