I searched for a similar thread and couldn't find one - I apologize if this is a repeat! (I'm sure the topic has been mentioned, at least briefly, somewhere...it is a horsey-topic after all.)
I have worked at, boarded at, and visited barns with all different set ups for feeding hay, either for at shows or if the horse is stalled regularly.
I know some people who use hay bags to slow down quick eaters, and I must say they make picking stalls easier - though stuffing all the flakes in there can be a pain!
Personally I like my hay on the ground if my horses are stalled (usually reserved for shows). I have been feeding cubes at shows lately, though, since it is easier to haul around, less dusty, and I lose less of it as I put it in a bucket so it isn't used as extra bedding.
If your horse is ever in a stall, how do you hay them? A hay bag, overhead manger, lower/corner manger, on the ground?