Better 6* Sig Investment. King Groot or Knull?

Kennado

I would've made a poll but have zero idea how but Knull is unduped and King Groot is sig 20. If it were your account and taking into account upcoming Paragon content, which champ is the better one to invest in for Battlegrounds, Story questing, AW/AQ, and Monthly general questing?

AMS94

If it was my account I would first invest the stones in Herc & Angela
Then wait for the EOP to drop & see which champs sig ability is more useful for the fights there
I think Knull's sigs give him slightly more & faster damage while KG's give more sustainability
Depending on that u cn chose which one u want more
On my account I might have gone for KG but that's bcoz I place a lot of value in sustainability
I prefer finishing fights in 2 minutes with 90% health instead of finishing in 1.5 minutes with 80% health
U can decide based on what u prefer