OP here. Regret: a box of books I've never reopened and paid a fortune to ship. Wish I'd brought: my proper kitchen knives, which are weirdly hard to replace well here and which I use every single day.
I shipped a box of books I've never opened and left behind the one kitchen gadget I now can't find anywhere here. The calculus of what's worth the shipping cost vs buying again is harder than it looks. What did you drag across the world and regret, and what would you never move without?