Voiddance is without question the most useful disc monks have.

or would be, if stonestance didn't exist

The problem with stonestance is it makes voiddance not useable. If a situation isnt bad enough to need voiddance you're better off making sure voiddance is available when you need it.

Stonestance is great but it cant save any pull like voiddance can.

In kunark yes, voiddance was trump'd by stonestance. In velious, voiddance made a comeback because its nearly impossible to stonestance tov mobs. Voiddance is the raiding defensive and stonestance is for p much everything else.

You can use stone stance 5 times for every one time you use void dance....I guess in extreme high end raid scenarios void dance is good, but I don't think that's what OP was asking.

Voidance is the special trick shot you use to pull a raid mob or a highly contested long respawn mob in a short period of time. Coupled with a Bladestopper, you can do some great pulls in 10 seconds.

you aggro a flurry drake

you fail feign death

stonestance will not save you, voiddance can