I think of them in terms of trustlessness. I would say that the entropia tablets are the most trustless because you’re directly selecting the key material; rolling dice is in the middle because the dice rolls have to be processed to obtain the key material, but that process can be validated with a secondary device; and then the photo method is the least trustless because there’s more trust in our code, and the process isn’t practically verifiable with another device. I hope this is helpful. 🧡