At first it was it was Phoebe but then as time went by Paige and Piper became very close

hmmmmmmmm at first it was pheobe but later on paige and piper became closer

by the end piper and paige were closer. they seemed very comfortable together and were both more focused on witchy things then broody phoebe

at first it was phoebe till phoebe acted like a total bitch 2 paige over COLE like that guy was worth a sisterhood...not!!! Piper was a better sister 2 Paige and it goes 2 show u wat a good person Paige was cause she was the only reason Piper didn't give up on Pheobe when she was evil

definetly phoebe

At first,Phoebe,but after Season 7 Piper

Piper

at first phoebe was closer but with time paige and piper became very close.

at first it was phoebe but later it became piper even though the eldest and youngest normally fight most

because she didnt like prue (much),she gets alone more with paige...,,it is a new start",alyssa says

I believe that Piper will always have an aversion to Paige for replacing her favourite sister. Phoebe on the other hand loved her from the beginning.