I would say having it written is more secure. If you hide it in a good spot no robber is going to find it and even if they do you will almost certainly know you’ve been robbed so you can change the passwords. Not only that but I bet 99% of robbers wouldn’t have an effective plan to sell or use the passwords. Digital on the other hand has a significant chance to go undetected for a while and certainly know exactly what to do with them.