Smart TV is a lot of hype and nonsense. One will hardly use those features after the novelty has worn off. Choose a TV based on inherent/prime factors such as picture quality, colour reproduction, native contrast, black levels, response time, lack of judder/ghosting, etc.
Between the above two models you mentioned, both are near equivalent except that Samsung has active 3D whereas LG has passive 3D. Earlier active 3D glasses used to be very heavy and cumbersome but of late they have improved on both factors. The passive 3D glasses are much cheaper (Rs. 1200 for a pair or so).