My most favorite is Unconditionally
My least favorite is I'm Still Breathing

(Not including Katy Hudson)

Mess

My most favourite is Teenage Dream
My least favourite is Roar

(Coming from someone who hasn't heard half of her discography though... )

Most: E.T or WOA, both are amazing and I can't choose

Least: Roar

Most: Walking On Air/E.T.

Least: Roar

probably, idrk.

Most favorite : Legendary Lovers
Least favorite : Firework - it makes me cringe

Most: Hummingbird Heartbeat.

Least: This Is How We Do

Most: Ghost

Least: This is how we do

Most: all songs on One of the boys
Least: This is how we do

twins.

Most: Love Me
Least: Firework or Peacock, her stuff with Stargate was just

Most : Unconditionally

Least : Ur So Gay

best: teenage dream
worst: roar

Most: Walking on Air
Least: Last Friday Night

(just from what I've heard)

best: i kissed a girl
worst: im still breathing

My favorite is either Thinking Of You or Teenage Dream. And the song I like the least is probably Last Friday Night. Or Milk Milk Lemonade if that one counts.

Most: ET
Least: Last Friday Night

Most: The One That Got Away
Least: Peacock (Such a terrible song which most of my friends love)

Most favorite: I don't enjoy it anymore, but probably it's Roar. I haven't listened to a song by hers as much as I have listened to Roar
Least favorite: Every song on second half of Prism sans Choose Your Battles.