Locks such as Abus Bordo can be defeated. IMO they are a step up from cable. I use a security chain and lock. I like it best because it gives me more options on what I can lock to. I think it also is less likely to be defeated by most thieves using either a large bolt cutter or portable grinder with a steel diamond bonded grinder. Yes it is vulnerable to the latter but harder to on a chain than U-lock. This is due to that the chain flexes. On bench or with some support the U--lock would be better. Myself, I have used a corded angle grinder with a composite blade to cut this chain but the only way I could do it is to clamp the chain down to a work surface, otherwise the wheel can jam and explode into pieces. The chain and lock weigh 3 pounds so likely less than a good U-lock. There may be better options