Clean

All Too Well

Let me narrow it to top 5 (no particular order):

I Know Places
Wonderland
Red
I Knew You Were Trouble
All Too Well

Honorable mentions:
State of Grace
Blank Space
Shake It Off

Style

Taylor Swift: Should've Said No
Fearless: You're Not Sorry
Speak Now: Haunted
Red: I Knew You Were Trouble.
1989: Wonderland

Taylor Swift: "Mary's Song (Oh My My My)"
Fearless: "You're Not Sorry" (this song is so underrated by Swifties. It slays so hard)
Speak Now: "Enchanted" (I had a few other songs in mind until the 1989 Tour performance and I decided it's in her all time top 5)
Red: "Treacherous"/"Holy Ground"/"All Too Well" (really can't decide; I love all 3 equally)
1989: "I Know Places"

Style

Back To December

Debut cold as you
Fearless breathe
speak now dear john
red : all too wellwelll
1989: shake it off

Enchanted, I'd say.

Taylor Swift - Mary's Song > Tim McGraw > Our Song
Fearless - Untouchable > White Horse > Love Story
Speak Now - Back to December > Long Live > If This Was a Movie
Red - All Too Well > State of Grace > Red
1989 - Blank Space > Style > Out of the Woods

all too well
and enchanted

Blank Space.

All Too Well and Treacherous, I think.

All Too Well and State Of Grace
I can't choose

I Knew You Were Trouble

Begin Again.