Superior.

The key differences between old vs. new wood ...

The difference between old growth wood and new growth wood is like the difference between granite and paper. Old growth wood has better stability, durability and longevity. New growth wood and the windows they’re made of, begin to rot and warp after only twenty years ...

The value of old growth lumber is the reason we should NOT throw out old windows. These old windows are structurally superior and can be restored instead of replaced. An old window will last another 100 years if properly cared for. It’s true, “they don’t make ‘em like they used to.”