Protected Content vs Membership Pro

I am a bit puzzled you have two plugins with almost the same purpose Protected Content vs Membership Pro...

I am tryoing to build online community with content that will be only available $$ to the members ... Please let me know what is the difference...

I will have blog/news with posts/articles that will be partially protected, forum bbpress, buddypress, listings (directory), chat, classifieds and all advertizing tools you have to colect e-mails

I guess I should not install them and use both!?