It's an interesting situation - it's not every day that you get to see the outcome of the road not taken, what might have been. As the married Applejack and Rainbow Dash talk to the dating Applejack and Rarity, they get a bit competitive over who made the better choice.
The other Rainbow Dash and Rarity think it was obviously them.
[A RariDash story that ate what started as a commission for Spamotron]