I prefer Heavy rain, for the atmosphere and replayabillity.
The walking dead was pretty good for 1 playthrough. The first and third episode were the best, by the 4th all illusion of choice was gone and zombies turned from a threat into nothing more then a shove the plot along device.
Yes in Heavy rain there are points where the game refuses to let a character die, but I still prefer that over the silly way twd insists on killing Ben and Kenny for example. Plus in all those months nobody had figured out that all you have to do is smear some zombie blood on you to walk undisturbed between them? really?