Definitely Webmoney. Skrill is a reversible payment method and they often lock accounts concerning Bitcointrading.
WM is not the best payment method, better take a closer look to PM and Payeer, but they're at least not returning funds back as they like.
Totally agreed with DARKCHANGE. If you still want to use Skrill though have in mind that you can exchange Skrill to
BTC on CEX.IO.