In what wallet should the byteball sit before I get the airdrop??
It depends on what kind of operating system you are using all kind of wallet available to download from official website. You must explain what is exactly you asking about the wallet.
https://byteball.org/Actually, this doesn't matter if you're speaking of just Bytes (GB or GBYTES, is the typical unit). You just need the wallet seed, you don't even need to have a wallet installed anywhere, since your Bytes are stored in the DAG (the Byteball data structure that is similar to a block chain in most conventional crytpos). As long as you already own some Bytes before the airdrop (and they're controlled by the wallet seed in question) you'll get your airdrop Bytes in the DAG , and you can access them after the distribution by restoring any Byteball wallet using that wallet seed.
Linked bitcoin balances and receiving Blackbytes during an airdrop is another matter, though, so it's best to have the wallet you originally used to link with the Transition Bot running to get those. Say "Hi" to the Transition Bot to review your airdrop details.