avian scream or repulse shot?

[Cormz]

i have a lvl 31 pure dex tank and i cant decide between avian scream or repulse shot.

[Kossi]

repulse shot definitely

[TOASTYTorpedo]

repulse. BUT try to get at least 1 points in avian scream for the stun... and definitely max repulse.