But you have to stay positive for a LOT longer to get 500 void points than you do for just a +25 k/d which carries over game to game and counts assists... and you can get kills using any weapon, super, grenade, etc for invective. With the thorn bounty you have to use AE or Word as your primary for them to count, both of which are b-tier at best in pvp, AND special/heavy ammo has been nerfed in pvp so it's now even harder to do the thorn bounty. And of course hunters don't even have a void ability if you play with those.I never play PvP and I found the 500 pts void kills to be much easier than the 25 k/d ratio.
You have to stay positive for both, but the goal line is much, much shorter for invective and there are NO requirements in terms of what weapons/abilities you have to use, unlike the thorn.