Perhaps because of their similarities, they constantly challenge each other.

At Chilton, they compete for everything from the top grades to extracurriculars.

Outside of their education, they share many formative experiences.

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Rory convinces Paris to go on her first date with Jamie (Brandon Barash) despite the nerves.

Though they cut it short, Paris' insistenceforces Rory outside her comfort zone, which she needs.

This dynamic is something Rory and Lane or Lorelai and Sookie don’t have.

Rory (Alexis Bledel)and Paris (Liza Weil) wearing graduation clothes in Gilmore Girls

Image via The WB

Forget Dean, Jess, Logan, and even Luke!

Paris never hesitates to tell Rory her thoughts, whether or not she wants to listen.

One of Paris' best moments is her months-long refusal to accept thatRory dropped out of Yale.

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Rory does the same for Paris, albeit with a little more tact.

Of course, they have more than a few fights, even after they become friends.

There isthe fencing match at Chiltonin response to a perceived betrayal.

Gilmore Girls Poster

A dramedy centering around the relationship between a thirtysomething single mother and her teen daughter living in Stars Hollow, Connecticut.

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Gilmore Girls