Fair.Trifecta for Penny. My current save is with Abigail but if I'm honest, it was a bit of a chore chasing her around (not as bad as Leah though). And I initially liked Emily but I quickly identified her as one of Matt Groening's Elves to be Avoided, namely "Excessively Happy." (unfortunately this comic is impossible to find online)
And while chasing Abigail, I still ended up interacting with Penny more.
So: Penny best to chase.
But Abigail is still Best Wife.