Why would you want to get the hands farther from the head on the downswing?
Only reason is that if you make a long backswing, ala Davis Love, than if you can floatload by an extension outward away from the target until the hands get to a position similar to that of a NORMAL length backswing, then NARROW is better.
Extensor action: The right arm trying to STRECH the left arm away from its shoulder socket below plane. It WILL get to straight (the right arm) when the left arm gets released to 90degrees from the shoulders.