I never use the SmartTV software and apps. I always find them rubbish. Possibly android based? Always buy an AppleTV box to go with tv I find it much better.
It's like asking if someone should buy a speaker system or soundbar to go with the tv when the tv already has speakers.
I have problems with the centre circle button being right next to the surrounding circular buttons. I often press the outside button when trying to press the centre. It's hard to feel the difference.