the old man
Both are very good. I have a 42" LG upstairs and a 23" Samsung in the kitchen. Of the two, Samsung had far better wi - fi ( I had to use homeplugs to make a wired connection with the LG as the wireless was very slow). Also, the Samsung has more "catch up" apps - BBC, ITV, 4oD etc, whereas my "Smart" LG only has BBC. To use catch up on , say 4oD, on the LG I have to attach an iPad or laptop with an HDMI lead.
If "Smart" is what you want, I would go for a Samsung.