Tim Good did. He is the technical director and decided these were his favourites. Not because they have the highest profit margin but because they are all-round good locks which cause us the least issues in terms of reliability. Tim works with the manufacturers closely and has seen how they are built and which are made using quality materials.
We would probably say that you should try and choose a "closed shackle padlock" if it will fit. That would be our number 1 recommendation. Why? Well we have conducted many tests and always closed shackle locks tend to win over standard types. However, closed shackle locks are tightly fitting which means you have to get the dimensions just right. Look here how this discus lock is tightly fitting compared to the standard "open shackle lock" next to it!
You'd never get a saw or bolt cutters on that discus padlock which is also classified as "closed shackle". In this photo it means you'd either have to attacked the large sliding bolt or the padlock body. Neither of which is going to be an easy job for a thief! The brass "open shackle" lock however was no problem for bolt cutters.