Well to help you make the choice, you should try this also:1) go to the YouTube apps of both TVs and try to play a video longer than and hour and see what happens.
2) if you've got a tablet or even your phone, try to steam a movie to the TV's also for an hour.
3) do the same with the browser. Either from YouTube or any other site. Search for movies, videos longer than 45min.
4) when playing movies, pause and restart and also change apps, to test the multifunction capabilities if LG. It didn't always work as expected.
Cheers.