you should take the ETH, active market everyday (all bitcointalk user usually transaction with this one) for their bounties. airdrop or any else
idk about LTC, meanwhile i never watch their market

but look, did you ever see ppl here told you to place your LTC address to bitcointalk profile location ?

You are right, I also choose ETH because it is widely used, it's rare to see anyone mention LTC. And ETH is used as a value for all airdrop & bounty bonuses