This is one of those "it depends" kind of things - like what is available in your area, what do you do with the minis, etc. I try to get the best quality second cutting grass (timothy) hay that I can find. I like second cutting because it is usually finer and easier for the minis to eat. BUT, I have one mini that is insulin resistant, so for her I either 1) test hay and use the lowest NSC I can find or 2) feed some of the big horses first cutting hay or 3) use whatever has been working when I get new hay for the rest. Ours get their alfalfa in cubes, which I soak and feed as a bedtime snack, but can't give any to the IR mare. She gets her usual hay instead and doesn't complain.