I don't recall seeing anything that makes one or the other more beneficial.
Did I miss anything?
Just to set the record straight:
Skeletons don't resist either piercing or slashing damage. Instead, they are vulnerable to bludgeoning damage. No, that's not the same because it means edged weapons are just as effective as fire or acid attacks. It's the blunt ones that stand out.
I think we houseruled that skeletons are resistant to piercing; it just made sense to us.