Pchain is a great project, and the code keeps a positive development, while edenchain is a project from South Korea, so has a high rate of hype, easy to make money, and usechain code library volume is small, I doubt that it is a fraud project.
You are right about Edenchain, with the Korean's Hype it is good to invest, But Usechain i don't think this is a scam project, I don't know about the code, so I will not concern about it, But In their team have many famous and experts come from many popular project, They get invesment from many capital like JRR , how could it be a scam ? It can be a bad but not scam project I think, this is my opinion