This is a common question: what type of lock should I use?
The choice of lock really depends on where you're thinking of using it.
In an urban environment, I would not consider a cable and instead use either Kryptonite or Onguard U locks. They are great and both offer insurance against stolen bikes. They have different security levels depending on how "bad" the area is.
I have been using the same cable lock for many years. I would highly recommend using a braided cable lock. They are much harder to cut. I am using the 10 ft Integra flex w/ combination
. I like the combination because I tend to lose keys and I like the way you can lock 2 bikes together, including the 2 wheels. When I am on a tour, I sometimes lock the panniers on the bikes while I sleep so that I don't have to worry about someone stealing them.
When touring, if I am in an "unsafe" area (usually in a larger town), I use a U lock (but not one of those super-heavy, high-security ones) to lock the bike frame to a post or something else, and I use the Integra Flex lock to secure the 2 wheels and the frame.
But again, a U lock is the best choice for a high-crime area.
In town, try to lock your bike in front of a police station or at least in a street with a lot of pedestrian activity.
Here is a good link for selecting locks for bicycle touring
Everyone has his or her own idea on the subject, so any comments would be appreciated.