The low life thief won't know about the nut locks before he brings your bike home. So it won't prevent theft.

A smaller U-lock lighter and cheaper, and is harder to break off with a lever (since it is tighter around your frame. But it limits where you can lock the bike to. Best to have 2 locks to make it look more complicated to steel.

In addition to locks, make the bike look as unattractive to thieves as possible.