I think its silly people complain about paying $15 a month for WoW, I mean for the price of a movie and drink you're getting a full month of entertainment. To answer your question though, play WoW. I played RS for a long time, got to the "fun" stage, did everything the game offers and WoW is just in another league. The most boring things in WoW are as fun as the funnest things in RS. My opinion of course, but im sure lots of people would agree. And then theres the fact that you can put WoW down without thinking about playing it, unlike RS. Its much less addictive.