What are we talking about here? Small square bales? As a youngster I hauled thousands of those, wich is probably why I have a bad back right now.
The main reasons people went with the large round bales is, 1. they don't need covered storage, and 2. less, and easier handling.
If all you have is a couple of horses, and you have a hay barn, there is nothing wrong with small square bales. If you have to feed 100 head of cattle, you really should look at a big round baler. And if you grow alfalfa and want to ship it down to us poor Texans, who will pay handsomely for it, since we can't grow our own, then get a big square baler. They fit real nice on them big flatbed trucks.
Ernie