You can't really compare them, as they are very different.
WoW is a massive world where you are always with eveyone else with the exception of about 7 instance(private) dungeons. While in guild wars, most of the game is instanced(private) for your group, while the cities are public.
Wow put lots of importance on levels and items, while in guild wars there is only 20 level, and you can even start directly at leel 20 if all you want is pvp. Wow has tons of skills while guild wars has a limited selection of skills.
They're two different kind of games, I'd say they are opposite to each others. Both are interesting in their own way.
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