The wzs 1-3 are more "casual", usualy usually the people on server do, and you get easy 150-200k in 20 or 30 minutes,if minutes if everybody contributes... I sugest suggest buying minor tokens if you dont 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 usualy 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).