I prefer Paypal because if you have an account with them, you can use credit cards or get it debited from your checking account without having to enter any bank information for e-cheques, and it has been more secure than other checkouts I have found.
Shipping information
I would prefer not to ship to France. But I want you to know I am not discriminating against the French because I happen to be a 1/4 French from France and have relatives there. It is just that the postal system there is a major pain-in-the-neck.
Return policy
Exchange unless I can't find it then I'll refund your money.