Who should i r4 next

MrMandella

Ok i have a couple of different options here and I'm torn on who to rank up next. Currently bgs focused as I've 100% 8.1 and will eventually but slowly 100% act 7 as i wait for 8.2. I already have r4 doom, r4 scorp, r4 warlock, r4 apoc and r4 hype. Also i have a spare cosmic and mutant awakening gem if it's required for one of the following champs, but no sig stones to sink into any of them. TIA!