The New York Noose has a Sold Secure rating of Gold. The chain links are 12mm thick, and are six sided instead of round, which makes them impossible to cut with manual bolt cutters. Given that any thieves would need to use power tools to break this chain, it will buy you plenty of time to save your...
This folding lock is a great alternative to u-locks and chain locks of the same security category. If your security risk is medium or low, for example, you have a cheap bike, or you only ever leave it in the hall of your apartment building, the Bordo 6000 will do the job.
This Albus u-lock is a great option if you have an expensive bike, and if you need to leave it in more dangerous areas of the city. The 'u' part o the lock is a parabolic shape instead of round, which makes cutting it with bolt cutters, car jack or saws too time-consuming to be possible. Ev...
U-locks don't generally transport well outside of backpacks or specialized u-lock holders that mount to the frame of your bike. It's a choice between having less space and more weight in your backpack or cluttering up your bike frame with an extra accesory.
The New York Legend 1515 chain is very heavy (15+lb). It's so heavy that it would be impractical to take it with you on a daily basis, but it's great to be used as a stationary lock at, for example, home or work.
The chains on this lock are 9mm in diameter, which makes it good for only quick stops in busy urban areas. Chains under 13mm can still be cut with bolt cutters, which isn't good enough for higher-risk settings.
Do not expect this lock to protect your bike in high risk situations (leaving your bike where there's a crowd, especially if your bike attracts thieves attention). The tubes 13mm diameter is not invincible against bolt cutters.