At the least, in DGQ, you can sort of WORK OUT step by step to the conclusion. Instead of like detective conan where you have to jump to conclusion before working out the way someone did something. For me, I dislike having known who is the culprit first , or guessed who is the culprit before working out the process. So, I would prefer the cases in DGQ to COnan. But For the story progression and twist plots, I like DC better since there are more unexpected outcomes from DC than DGQ.