[Loki]

I'm not sure it's correct to say they are completely different. In many ways the supplied event gear is like a simplified version of the normal PvP - less choice of scrolls, pots and no poison on your weapon, less management of resources and no need to worry about gear differences. My personal feeling is that if you are going to invest a lot of time in mastering one or the other it's the real world, your-own-gear PvP that matters more, the supplied event gear is almost a training version. Like I said, just personal feeling though. Doubtlessly there is a lot of overlap between the skills required in both instances.

Think of it as the difference between jousting in a tournament and actually charging the enemy on a battlefield.