Very mild Cursed Child spoilers
When I picked a wand for Albus, pine and phoenix feather jumped out at me, and likewise, consistent and faithful unicorn hair seems like an obvious choice for Scorpius. The fact that both of them would then have the same wand cores as their fathers, despite being quite different people, is an added bonus.
For the wood, I like the idea of Scorpius using a larch wand. Here’s what “Ollivander” has to say about it:
Strong, durable and warm in colour, larch has long been valued as an attractive and powerful wand wood. Its reputation for instilling courage and confidence in the user has ensured that demand has always outstripped supply. This much sought-after wand is, however, hard to please in the matter of ideal owners, and trickier to handle than many imagine. I find that it always creates wands of hidden talents and unexpected effects, which likewise describes the master who deserves it. It is often the case that the witch or wizard who belongs to the larch wand may never realise the full extent of their considerable talents until paired with it, but that they will then make an exceptional match.
“Hidden talents and unexpected effects” describes Scorpius pretty well. He is an unusual hero on many different levels, and takes a while to show what he’s really capable of. One of the best parts of Cursed Child is watching him grow from a timid, socially awkward child who certainly wasn’t eager for adventure, into a true hero. The larch wand’s description indicates someone who has the potential for courage and confidence, but needs a little help to grow into that potential, and that’s definitely Scorpius.