I've got the Panasonic system you mention and its a Nice system. It has 2x HDMI passthrough, comes with 1 wireless box and if you get another and some speakers you can make it 7.1, and the sound is quite good as well. Can't help with the Samsung one though sorry.
What unit sounds best to you for music / home theatre? Head into a store armed with a BluRay you know well as well as a CD, get the remotes in your hands, play with the menus... and LISTEN to them. Everything else you read about on-line will be superfluous to how they sound. My $0.02.