The five main ones are:
Journal of Forensic Sciences
Journal of Forensic and Legal Medicine
Forensic Science International
The American Journal of Forensic Medicine and Pathology
Forensic Science International: Genetics
I do not have an opinion on the best forensic psychology journal. However, I do appreciate that some journals like the Open Access Journal of Forensic Psychology allow readers review all of their articles in full and for free. They have a lot of very interesting and useful articles which I have greatly benefited from.