Read two posts above. Right now the answer is we want Atlanta to win only because a 1-1 Carolina and 2-0 Tampa can kick us out of the Playoffs immediately.
Now, as far as 2 NFC South teams, Washington and Dallas all sharing a 10-6 record, I'm not sure who we would want to win based on that. Dallas would be kicked out of the first tiebreaker as well as the NFC South team that loses the NFC South tiebreaker. It would then be between Washington and the remaining NFC South team. Hopefully, Washington would win the tiebreaker first because we'd be screwed if for example Tampa won the tiebreaker vs. Washington, because then there would only be one slot left and we would lose that last wild card tiebreaker since the remaining teams would be Washington, us, and another NFC South team. We'd automatically be booted out because Washington beats us in the NFC East.