Well, I think it's a bit hard to compare two brands who are on the top in term of consumer electronics market. The technology that comes with them are way different.
If we compare both the models, I will adore LG not because I own it but also due to latest tech implemented in the same.
LG uses passive 3D glasses in their smart TV which have been proved to be flicker free a and Samsung uses active glasses which are said to have flicker in them(though I am not sure about the current status of the same)
I have still to use the apps of my LG smart TV so I am not in a position to differentiated them on that basis.