I have many locks. Each bike gets a minimum of 3 locks plus the Pitlocks.

4 Kryptonite New York Fahgettaboudit Mini locks
4 Kryptonite Evolution 4
2 Kryptonite mini locks
4 Krypto cables
2 Abus Bordo 6500
Pitlock locking skewers

These lock threads always turn into a pi$$ing match. ALL LOCKS ARE DEFEATABLE. What you try to do is chose a lock that minimizes your risk by calculating, the neighborhood you live/work in, the value of your bike, and the likelihood of the bike being stolen. My risk is high, therefore I use multiple locks. When I think that the risk is too great, I just use my Brompton and carry the bike. This way it never gets stolen. My new custom bike will never be locked because I will never leave it anywhere.