For online purhases and commissions, A.L.W.A.Y.S. use Goods/Services. Sure, the person recieving payment has a fee, but that protects you BOTH should something happen, like the artist disappears without finishing the commission or the buyer doesn't pay.
Never, ever, ever pay for something using friends/family, no matter what the artist or seller demands. There are built in protections in Goods/Services, and you NEED that protection if something goes wrong and either side wants their money. If they whine about fees, they should have taken that into consideration with their prices, and call out any 'Paypal fee'; the seller should not need to surcharge for something they should have accounted for in their pricing