Steam flaked is the best as long as it is good to start with..... Several of the feed companies will buy low quality corn and steam flake it... coat it with molasses add some fluffy filler and call it show feed.
We feed about 1/2 cracked and 1/2 ground corn, but just because our local feed mill can't steam roll it. However, it has seemed to work fine compared to what I was used to before we started having our own ration mixed.
For our "summer" or grower ration, we do substitute quite a bit of steam rolled milo for corn though. Anyone else use milo much? It has seemed to work well.
We also like the steam rolled, we had trouble getting it back years ago when we ground our own feed and actually bought a roller, talk about work! For the feed we put out for the cows we just used ground corn, but it is more for maintenance and to keep them coming up.
We don't use Milo but have in the past, it is about impossible to get around here.