There is not “the” answer for this question. It always depends a bit on your individual situation. When you park your bike in a very lively area, chain locks, cable locks and D locks can be secure in this surrounding. When you park your bike in a very lonely, while night not illuminated area, then it is more an invitation for stealing the bike. The challenge in such situation is that the potential thieves have a lot of time and while night the are even barely visible due to the lock of illumination. So the can take time trying to break the best bike locks.
Sometimes people do not lock their bike to something which cannot be moved – e.g. by locking your bike parts but still allowing the option that a thief is lifting the bike and is carrying it away. So finding “the safest bike lock” is a mix out of the usage of two different but good bike lock types (e.g. a D shape with a cable lock), the surrounding where you want to park you bike – decide for safe areas and a good locking method – lock your bike to something which cannot be moved and lock both wheels as well as the frames and if possible the saddle. When you buy a bike lock invest per lock always around 10% of the value of your bike.
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