I think I understand what you're asking - you broadcast a transaction to everyone, so it should be included in both chains eventually, so it doesn't matter what chain is the longest.
To refine this slightly: chances are your transaction will be included in both sides of the split. Transactions that are only on the shorter side of the split will automatically get transferred over to the longer side. Except for the first transactions in the block, which pay the miner, because they lost the bid.