From what I understand, any cable in inferior to a u-lock. As any lock can be compromised by a cordless angle grinder (even the NY fuggetaboutit) they are rated on the number of minutes it takes to cut thru. My Onguard Brute takes 5 minutes, which is very good for it's price. In Europe, we have Sold Secure which does several tests (ending with the angle grinder) on mainstream locks. So I hunted for one with a reasonable price with a gold rating.

PS: my lock is 4lbs! Pretty ironic to think of those expensive superlite carbon bikes probably need something even heavier to keep them secure.