Recently went through this process myself. My conclusions were to buy two locks, 1 D-lock and 1 chain type lock. Rationale: any lock can be broken given the will; d-locks and chains require different kit to break; it's likely that a thief will only carry one set of kit; having two different locks increases the difficulty somewhat.
The best rated locks I found were:
D-locks: Kryptonite New York or Fughedaboudit (the small yellow one), ABUS Granit X-Plus 54
Chains: ABUS Steel-o-Flex, any of the ABUS/Kryptonite chunky chains.
I just use my D-lock in the day, there are plenty of bikes round where I am with crap locks that would be far easier to nick.
Recently went through this process myself. My conclusions were to buy two locks, 1 D-lock and 1 chain type lock. Rationale: any lock can be broken given the will; d-locks and chains require different kit to break; it's likely that a thief will only carry one set of kit; having two different locks increases the difficulty somewhat.
The best rated locks I found were:
D-locks: Kryptonite New York or Fughedaboudit (the small yellow one), ABUS Granit X-Plus 54
Chains: ABUS Steel-o-Flex, any of the ABUS/Kryptonite chunky chains.
I just use my D-lock in the day, there are plenty of bikes round where I am with crap locks that would be far easier to nick.
Courant