It doesn't really matter for me. I am going to sit tight with bitcoins on both chains, if a fork does occur.
So which ever chain the distributors pick, I am going to get my GB.
Not efficient. You might get double reward during the airdrop by knowing the chain in advance and selling BTC on one chain for BTC on another.
Why do you think you would get double reward then? at the same time you would be just long one of both...