at my old apartment i locked my bike in a forbidden place and my super cut it off, not knowing it was mine. it was a kryptonite mini, the orange one. he said it was extraordinarily difficult to cut and the only thing that worked was a grinder.
since i cant imagine anyone using a grinder on a public street in the daytime, i feel confident with a mini almost everywhere. at night i use the NY fahgeddaboudit yellow U. i also have a NY noose, but i feel like it is inferior to the fahgedtabboudit U, which appears to me to be truly indestructible.