Live might be the better and more funner but it may get laggy depending on how fast the commands execute. On the other hand... turn based would seem a lil boring but it sure wont lag depeing on how you coded it. But id go with a live battle system.
- Dark Emrald
This is why I prefer DotA Allstars to World of Warcraft: PvP is central to every game, playing for a long time doesn't give you a level benefit, and you don't have to grind to gain levels -- you just focus on power plays and PvP and you gain levels almost as a side-note.
Try it out if you haven't already.