I don't usually ask for rankup advices since I just rankup and use whoever I like but I'm genuinely conflicted here, I got r3 skill gem from necro and I don't have black cat, crossbones or bullseye, my options are

Just pulled bwdo from titan while hunting prowler, I'm looking for a bg attacker with more versatility and preferably a nuke, I don't want to r3 a pure defender being korg so who would be a better r2 and a potential r3 candidate for me, won't rank km before dupe