Armada and Line are two pretty good skis. If your looking for a park ski then Line,for an all mountain twin tip ski that are still reliable in the park then Armada.
It depends on what you want to be doing...Just any good twin-tip could come from Armada, Atomic, or any good park ski manufacture. You can demo different skis...or rent them. It is what you can find...
you can easily ski backwards
but make sure you do it on a pisted slope not a moguled one or on off piste
because there is a risk of flipping backward
charlie.baker
Winchester