You have a fine lock. The only other "mini" lock sold in the USA that might be stronger is the OnGuard Brute "mini". The Brute locks both arms of the "U", and the Evolution locks just one. But, it would be a rare crook who has the time and energy to cut one arm, let alone two.

In a "lab" test, the full size Krytonite New York lock, and the full size OnGuard Brute will "score" higher than the "mini" versions. Thicker metal means they would be harder to defeat by prying or cutting while on a "workbench".

But, out on the street, the "mini" versions are likely to work equally well. I use the "mini" locks by putting them around the rear wheel directly behind the seat tube and attaching it to a sturdy pole. That protects both the rear wheel and frame. (I use a cable lock and bolted skewer to protect the front wheel).

The mini versions fit rather tightly around the rear wheel and pole, making it impossible to use a certain type of prying tool that is commonly used by crooks on larger locks. Cutting a lock quickly requires power tools, which does not happen on many public streets in the USA, outside of Manhatten.