It's impossible to choose a best, so I'll instead share a song whose lyrics I enjoy and connect with. It's "Out of My Depth," by Hot Chip. They're a band whose lyrics are often deep and meaningful, despite having a lot of fun "upper" music. I like this song because I'm prone to wallowing lol and it's a good reminder not to do so too much. It's ultimately a hopeful song.

When I'm in my darkest place, I must be careful not to dwell there

When I'm headed for the ditch, I must be careful not to sleep there

While I might enjoy the peace, there are other lights that call me

And although I'm out of the race, I know that something good must befall me

And when I'm swimming out of my depth, and I can barely see the crest of a wave that might destroy me

I must look for what I can't see

I must reach for what doesn't touch me

I must leave my lonely space and make time my only enemy

I must seek what can't be bought and make choices that support me

And the friends who fall apart from the crumbling walls that divide me

And when I'm swimming out of my depth and I can barely see the crest of a wave that might engulf me

Then I'm in my darkest room, but I'm careful not to enjoy it all too much

But as I leave, it will be helpful to have endured it

I must be careful not to trip, not to fall as I continue

But my darkest place is in me, and there's something there that calls me

(edit: improved formatting)