Isn't there 1 school of thought that instructors for beginners should be taking out the same skis from the rental fleet; so they can show they can show the same techniques with the same gear?
No. Makes almost no difference.
For a couple seasons years ago we had Elan short carving skis that every beginner got and you went and picked one of those off a rack for those lessons. (There were 3 sizes, but we never ended up doing the 113-133 progression.) The ones we used could have been 113 or 123. The worst part was the bases were so dry and hairy they stuck. We used to carry wax because the shop wouldn’t fix them.
Honestly, doesn’t matter all that much, something you like to ski on or should learn to ski. Unless you’re teaching a very specific thing like park where you need to do rails, or land jumps switch. I would say not center mounted, unless that’s all you have, and you really should learn the other.
Twin tips are annoying with the big tails that take up too much space, plus people following you at some speed get sprayed in the face. Walking with them tails in the snow is worse. You can ski switch on any ski. Btw, people love to ski backwards after their initial “no way!”.
I really don’t understand the “skis you don’t care about”. Yeah the tops will get scratched, why care? You ski on the bottoms. I draw the line at kids trying to step on the raised tip.
Something with decent sidecut is often better just to show how skis will carve - in a relatively small amount of space.
On the other hand, I remember when we went to shaped skis how much worse they were at wedging. But that was a long time ago.
The upshot is, it really doesn’t matter that much. Shorter, narrower, lighter generally. You’ll have to carry them. But, he’s young, and most of my time was spent teaching on heavy race type skis anyway. I’d say under 88.
What type of skis has he currently or has he skied in his last seasons?