Frostbiting is extremely good. It means 100% more damage to enemies meaning your Dmg will be doubled to frozen enemies and what really makes it so powerful is that frostbiting applies to each and every Frozen explosion and the damage spikes up in crits and deadly strikes or normal damages. The more frostbiting, the better of course.
High voltage is also similar effect to frostbiting but it make you deal effectively double damage at 100% high voltage. Shock doesn’t have a multiplying set but high voltage does apply to every Explosive affix explosion (if the explosion constantly explodes and maybe if the enemy is dead) for spike damage and bleed spiking up along with stack debuff. The enemies need to be stunned though from paralyze or other form of stun to actually apply. It’s definitely useful for sure 
On weapon, 100% WD may be better than 100% ED but you apply more 100% ED on gear as you can add that anywhere (not from Ruby crystal but from found legends).
A great guide to better explain may be this guide below but generally, WD% on weapon I think is very big on damage as the WD is what is multiplied by ED and 100% WD increase the base dmg by 100%. This also means more damage when multiplied by ED% afterwards and more DMG overall.