While the two series weren't quite similar aside from the common crime/investigation genre, there was at least one common trait. As in, the fact that both dramas featured Nishikido Ryo as an eccentric forensic officer/expert. And for people who're a fan of the actor, it'll be interesting to see how Ryo's character differed in Joker as compared to Trace.
Aside from the fact that both series had Nishijima Hidetoshi as its main cast, both series were centred on the Public Service Bureau and dealt with a number of complicated cases related. Both series also had some interesting mysteries/issues to delve into and some good action as well. Not to mention the OST was good as well.
