I'll take Song by Decision.
I'm not really confident about this pick, though, as Cejudo is/has been a "better" fighter, simply put.
Song can't lean on takedowns. He has to out-volume and out-last him on the feet while avoiding sneaky takedowns. I'm not sure he's skilled enough, but I'm banking on Cejudo fading mid-fight and losing the latter rounds after a close start.