What's the best insulation for a van conversion?

Desperately wading through dozens of videos trying to make sense of what insulation to use for your van conversion is a right of passage for everyone building a campervan. Hopefully this video gives you some peace of mind knowing that despite everyone's opinionated videos pushing one material or another, there are a few choices to pick from that all get the job done. You really can't go wrong with any of theses! Pick whichever one of these three options feels right to you and buy it! Decision made, well done. Time to move on to agonize over the next 100 decisions for you van build 😝

I'm currently building a Toyota HiAce and I've insulated it with a 10mm flexible closed cell foam (from carbuilders.com in Australia and Armaflex in Europe) for it's ease of installation.
HOWEVER! As the video suggests, I would also happily be using either XPS (Bunnings or online) or natural sheep's wool (Havelock is one option) as well.

Good luck with your decision!
Ask away if you have any questions at all, I'd love to be able to help!
Cheers