this will be my 2nd year baling for myself.
I have done a lot, maybe too much reading, to make this an easy job. As I posted elsewhere here, I think there are 2 levels to getting hay.
1) get it when its dry enough to go into the barn without cooking, going moldy and maybe burning
2) getting in wet enough to keep the leaves on the stems. The leaves, especially alfalfa, conatain 80% of the nutrition. So if you double the number of leaves you can keep on ......
The cloud of dust behind the baler is largely shattered leaves. Lost nutrition.
In arid areas where there is little or now dew, some farmers actually spend big bucks, like $ 25,000 for "dew similators" that are spray systems the spray water onto, and what makes them expensive, into the windrow, to just slightly soften the leaves, so you can keep them on the stems. The baler follows the dew simulator around the field about an hour later when conditions are just right. In big spreads, this means one tractor for the dew machine and one for the baler.
You've really got to hit the numbers right to do this and a properly used meter is a big big help, especially if you don't have 15 years under your belt.
I got a Deere. They all look pretty much the same to me. Do not get one that does not sense temperature. You want to be able to probe the middle of some bales, especially from the lower, wetter parts of your field, to make sure they are not cooking in the barn.