With the music I've been listening to the last 3 or so months, there's only one artist I have to bring to the table for best lyrics: Taylor Swift. It's impossible to say what the "best" is, so I'll give you a few of my favorites.

"And you call me up again just to break me like a promise
So casually cruel in the name of being honest" - All Too Well

"I knew I'd curse you for the longest time
Chasin' shadows in the grocery line" -cardigan

"Roaring twenties, tossing pennies in the pool
And if my wishes came true
It would've been you" -the 1

"You booked the night train for a reason
So you could sit there in this hurt
Bustling crowds or silent sleepers
You're not sure which is worse" -champagne problems