Originally Posted by
prairiepedaler
I'd like to add that the two locks should be of a different type (U-lock + Chain Lock, or folder) so that the thief ideally has to use a different defeating tool for each (unless we are talking about picking) and will probably only be carrying one.
I've not seen any evidence* that lock picking is a meaningful real-world threat to locked bikes. Mind you, it might be, but I haven't seen any evidence of it.
That said, your two locks? Let 'em have two different technology lock cylinders. The picker would need to have two different sets of pick tools and be skilled in picking two different kinds of locks.
Oh, and notice how youtube's 'Lock Picking Lawyer' always picks with his right hand, in good light, at a convenient height and angle? Even though I don't think picking is a real on-the-street threat to a locked bike, it doesn't cost me anything to position my locks so a picker would have to pick them upsidedown and backwards, lefthanded.
*Police reports, undamaged locks lying open on the ground where the bike was parked, miscreants arrested with pick tools, pick tools dropped in the dark and left behind, CCTV video, etc.