Hard to say, this is coming from someone who's played runescape for 6 years or so, and WOW for only a few months total.
I find runescape is more "addictive", when I played RS for fun, I could play it all day and not be bored, with WOW, I would get bored after a couple hours.
I like runescape's quests over WOW, the runescape quests have a bit of a better storyline to them, while WOW's quests are all the same, and too simplistic to really care about the specific storyline they give for each one.
Can't compare PVP I never did PVP in WOW.
Well, I guess thats all.
I would have to disagree runescapes storyline is absolutely atrocious. World of warrafts storyline is amazing, you just wont understand it unless you take the time too and stop speeding through text.
Ot:
Pvp in WoW vs runescape, wow wins. Simply because things are more balanced even though some things still need work but it is almost impossible to do that anyways. The pvp wow in much more interesting due to the fact you can do Arenas which is similar to the duel arena in runescape but it actually takes skill compared to lucky hits like on rs.
Graphics: Well wow wins.
Sub cost: Rs wins. But you pay for what you get.
Content: They both release content quite often but I feel the quality of wows content is much better.
Gearing: Gearing is much better in wow due to the fact you dont have to use all your virtual currency to get gear. You can obtain gear by doing battlegrounds and dungeons. While in rs most of your gear is obtained on the G.E. unless you already have gear to do corp and god wars etc.
Performance: I would definitely say wow wins on this too. Runescape is pretty laggy even on a gaming rig like i have. I get a constant 60fps in wow with almost no problems.
Interface: Wow has a customizable interface, what's not to love? Runescape gets a bit annoying.
Playabilty: Runescape I wont lie is very fun, but the effort and grind you put into it just doesn't seem as rewarding as wow. I also like wows camera movement and how you can zoom in on things. And mounts! Runescape needs mounts!
Classes and races: Wow obviously wins there, you can be a pure, rune pure, tank, or main in runescape for the most part. And everyone is a human in runescape. In wow you get to be tons of things and combinations. My favorite being the feral druid.
Anyways that is my quick review. I used to play rs religiously, then i started wow and i played that and it was the most fun mmo i ever played. Due to the addictiveness I quit and the sub costs are hard to pay for as well if your on a tight college budget.