Don't forget to move your Bitcoin on the winning chain to a new address, before moving your Bitcoin on the losing chain. Otherwise you're vulnerable to a replay attack. This also assumes that you know which chain will ultimately win.
Discussion
Because of the nature of the situation, you must move your legacy coins first to split them, irrespective of whether any chain “wins” or we have persistent dueling forks.
You don’t have to know the ultimate outcome to split safely.
We're saying the same thing nostr:nprofile1qqsxzsz83jdwztcapd2qulzhspnyjvn6jxcypvrl0w3aahp40j4smfgpz4mhxue69uhk2er9dchxummnw3ezumrpdejqzrthwden5te0dehhxtnvdakqfnk8t2
You do have to know if you want to sell one and consolidate into the winner. Which is the "airdrop" reference I was replying to. Otherwise you sold the winner to buy the loser. Like the bigblockers who sold their BTC and bought BCH with it.
And it also assumes there even will be more than one chain. This was my point above. Since this is not certain, trading the airdrop is super risky.