chvfrk98, you are right and ODT is right. The new Max's comply with Tier IV, but since they are under 25.9HP, they required not much more than a label to pass. At 26HP things ramp up a bunch on standards.
The Max 28 has more legroom and tilt wheel, that makes a difference if you are a big or tall guy, or both. The Max28 runs a larger tire and lifts a little more in the bucket. Both tractors are very capable.