@Jeje Himawan: I personally use paypal but have never used WM. I've been using it for over 3 months and haven't had any deposit or withdrawal issues so far. Paypal is much more popular in the world, especially in the US, UK, Germany, and Western European countries while webmoney is more popular in Russia and Eastern European countries.
I personally recommend paypal. Regarding fraud cases, difficulty withdrawing/WD, etc. both have these issues. You can check on trustpilot, paypal is rated 1.2 while webmoney is rated 1.9.