My ducklings get low protein mash which I strongly dislike. It gets wasted and once it hits the ground starts to ferment and stink, draws flies... they won't eat it if it's wetted. Ick.
Chicks and guinea keets get crumbles until they're old enough to eat with the flock.
The flock has until recently gotten pellets which are the cleanest, neatest food format we've tried so far. It's balanced, not powdery, and if one falls to the ground, someone will snatch it up before it has a chance to turn into fly bait.
We're trying out New Country Organics whole grain layer feed right now. I'm experimenting with soaking and lightly fermenting it and the chickens love it. Ducks hate it surprisingly... it's full of peas which they usually love.