I know you are asking BR this, but you may want to consider what your market will be. The difference in actual size between a 50 pd. bale and a 100 pd bale is really very little. The baler can be set to compact more or less.
If you are going to sell to horse people they usually prefer lighter bales as they are easier to handle and your price can be higher for less hay. It still takes the same amount of string so you make more bales but your string cost goes up x 2.
If you are going to use a kicker so it is a one man operation like round baling, most kickers don't handle too heavy a bale and you don't want them too heavy because they are a jumbled up mess on the wagon and will wear you out getting them off and stacked on skids.
If you use a stacker collector the bales can be big but need to drop on their side so the stacker can pick them up and make a cube of them in the cage.
At the barn the stacker pushes the cube out as a unit.
I think some folks use a grapple arrangement. And then of course picking them up manually and putting on a wagon or trailer using 2-3 people if you can find anyone willing to work that hard these days.
