These things I think are the best you can do. Near impossible to break. Difficult to pick locks.
Angle grinder beats everything but these will give them some trouble.
Here is a cheap but (probably) ok version,
This is what I use. Want the best and pay for it? I think this is it. My scooter is very expensive and worth stealing so I think this was worthwhile. YMMV
Downside? It is heavy and not easy to carry. I use a backpack and put it in that but without a backpack…dunno how you would carry this.