"Favorite" for me depends upon a lot of things, including mood, season, but one I come back to time and again is a Sonny Terry and Brownie McGhee version of

"That's Why I'm Walkin"

My boss man is so mean I works just like a slave
16 long hours put you In your grave
That's why I'm walking, Walkin my blues away
I know the sun's gonna shine In my back door someday.

I once had a car It were painted white and black
Couldn't keep up the payments The man, he took it back
That's why I'm walking, Walkin my blues away
I know the sun's gonna shine In my back door someday.

Well, I wouldn't tell a mule t'git up If he sat down in my lap
Ain't that the same thing Killed my own grandpap?
That's why I'm walking, Walkin my blues away (hey, hey, hey)
You know the sun's gonna shine In my back door someday.