Best Lock to Buy?

too weak, easily cutted through with a simple decent cutter from B&Q.

when I got my bike locked up with that and a Evolution Mini - this one got cutted, but Evo Mini didn't despite showing sign of attempt.

I have two of these- one that someone with a more "variable" set of ethics than myself has attempted to cut through. They failed.

Anything- absolutely anything, including welding your bike to the street stand will fail in the end. Sadly you just need to make your bike more of a pain in the arse to nick than the next bike along, or make it too inconvenient to steal in the time available.

The General Electric 7.62mm Mini-Gun with T1000 Sentinel Unit is the only choice if you want to know that your bike will be there when you come back.