There's no denying the similarities between the Guild Lord in Guild Wars and the Keep Lord in Warhammer Online. They're fundamentally the same, whether you're involved in a Guild vs. Guild battle or a Keep assault, when you kill the Guild/Keep Lord, it's all over. In a recent article at Kill Ten Rats, the basic comparison is brought to the next level with an actual explanation of each category of comparisons, from Best Style to Best Loot System to Best Glory for the Winner.
So if this aspect of either or both games has ever intrigued you, check out this article for some interesting analysis. Then next time you head out for that main assault on the Keep/Guild Hall, you'll be that much more prepared!