The wzs 1-3 are more "casual", usually the people on server do, and you get easy 150-200k in 20 or 30 minutes if everybody contributes... I suggest buying minor tokens if you don't have points, the investment pays itself fast. .
the wzs 4-6 are more hardcore, you need a team to kill the bosses, higher lvl team, and the drops are like parts of gnome set, but usually you need to be more friendly with the team, since they most likely to divide the loot for the team (at least by what I seen on my cases).