Deer will pound millet as it comes up. Plant enough they can’t destroy.
They will occasionally mess with Sorghum, but not enough to worry about.

Ducks, dove, and quail will pound the seeds out of both. Someone already pointed out that grain sorghum and milo are basically the same. Just remember if planting for ducks, plant in an area where the water can be added to reach the seed heads. Any crop planted specifically for ducks can’t be manipulated.

Now this is just my own personal observation on the properties I trap and hunt. We plant browntop millet for our dove fields and fill in logged areas with grain sorghum for cover and seed. The millet is where I place my cameras to pick out what deer need taken out for the season. Also provides plenty of cover while growing.