On youtube there are videos from an expert lockpicker, I can't remember the name, where he goes on lockpicking kryptonite locks. He explains in great detail what he expected more from the high end, but his recommendation by the end was still a kryptonite lock, not necessary the ultimate, and said that unless you are ready to lose the bike, unless it's in sight, there is very little you can do. And with an angle grinder you are doomed either way