The difference is only the flex. The Metal has a metal laminate in it that makes it stiffer, thus more stable, powerful, and solid feel for skiing faster with maximum stability & power. More Metal ski info...

The Vacation has a much softer flex for skiers that want to throw tricks and jib all over the mountain, you can easily butter and jib the entire mountain. It's more playful than the Metal but also less stable at high speed. More Vacation ski info...