Teenage Dream
Legendary Lovers
Waking Up In Vegas (this one was so hard)
Walking On Air
Unconditionally
Dark Horse
The One That Got Away
E.T
Lost
Love Me
Hummingbird heartbeat
Double Rainbow
By The Grace Of God
Wide Awake - Spirtual (can't decide)
It Takes Two
Choose Your Battles

All three of her albums are amazing.

PRISM (10) > Teenage Dream (5) > One Of The Boys (2)

One of the Boys vs Teenage Dream vs Roar
I Kissed a Girl vs Last Friday Night (T.G.I.F.) vs Legendary Lovers
Waking Up In Vegas vs California Gurls (feat. Snoop Dogg) vs Birthday
Thinking of You vs Firework vs Walking on Air
Mannequin vs Peacock vs Unconditionally
Ur So Gay vs Circle the Drain vs Dark Horse (feat. Juicy J)
Hot n Cold vs The One That Got Away vs This Is How We Do
If You Can Afford Me vs E.T. vs International Smile
Lost vs Who Am I Living For? vs Ghost
Self Inflicted vs Pearl vs Love Me
I'm Still Breathing vs Hummingbird Heartbeat vs This Moment
Fingerprints vs Not Like the Movies vs Double Rainbow
I Think I'm Ready vs Part of Me vs By the Grace of God
I Kissed a Girl (Rock Mix) vs Wide Awake vs Spiritual
A Cup of Coffee vs Dressin' Up vs It Takes Two
Hot n Cold (Manhattan Clique Remix Radio Edit) vs E.T. (feat. Kanye West) vs Choose Your Battles

OOTB: 2
TD: 7
PRISM: 7

so TD=PRISM>OOTB

in reality it's:

PRISM>TD>OOTB

teenage dream

One of the Boys vs Teenage Dream vs Roar
I Kissed a Girl vs Last Friday Night (T.G.I.F.) vs Legendary Lovers
Waking Up In Vegas vs California Gurls (feat. Snoop Dogg) vs Birthday
Thinking of You vs Firework vs Walking on Air
Mannequin vs Peacock vs Unconditionally
Ur So Gay vs Circle the Drain vs Dark Horse (feat. Juicy J)
Hot n Cold vs The One That Got Away vs This Is How We Do
If You Can Afford Me vs E.T. vs International Smile
Lost vs Who Am I Living For? vs Ghost
Self Inflicted vs Pearl vs Love Me
I'm Still Breathing vs Hummingbird Heartbeat vs This Moment
Fingerprints vs Not Like the Movies vs Double Rainbow
I Think I'm Ready vs Part of Me vs By the Grace of God
I Kissed a Girl (Rock Mix) vs Wide Awake vs Spiritual
A Cup of Coffee vs Dressin' Up vs It Takes Two
Hot n Cold (Manhattan Clique Remix Radio Edit) vs E.T. (feat. Kanye West) vs Choose Your Battles

OOTB - 6
TD - 7
Prism - 3