I just plain love Stevie Ray, he's probably my favorite single blues artist, period. Depends on the day, though.
Him, Son House, and Johnny Lee Hooker round out my favorites.
I don't know about "my favorite Stevie Ray Song", but I find myself listening to
Life By The Drop a lot. It's a great story.
I do love me some
Riviera Paradise, too. Smoooooth.
That tune right there will keep a brother from killing something.