You can cut down, chunk up, and limb several green trees without getting the chain dull.

On a dead tree its three or four cuts through the trunk and you notice the chain beginning to dull. At my age, I begin to dull too by then

In recent years, I've cut up more dead wood than green wood. If you have a choice, stay with the green.

When looking at old saws, the one that was used on green wood will have a better engine