I am assuming that what you have at the moment is not a smart TV in the sense that it has internet connectivity, that you are watching and recording programmes via a Sky box.
If that is the case, the first thing you have to understand is that smart TVs do not have recording capability. Everything you watch will either be live TV or streamed recordings via the internet. For the latter you need apps. These are either free to air, BBC iPlayer, Channel 4, U etc or you pay a monthly subscription, Now, Netflix, Disney, Apple etc
If you want to record from free to air channels you will need a recording device such as a Humax or Manhattan box which you connect to your TV aerial and connect the box to the TV.
Whether you will need a sound bar will depend on the quality of the sound from the TVs own receivers. Because smart TVs are thin there is little room for decent speakers so they can sound tinny but the technology is improving so try out the set before thinking you have to buy a sound bar.
I doubt any smart TV is going to last 16 years. The average lifespan is expected to be 7-10 as the LEDs (light-emitting diodes) in the screen will eventually fail. Also, after a while, just as happens now, manufacturers stop issuing software updates just as they do with computers.
I would decide on an overall budget and go from there because unless someone is a real tech-head there isn’t that much difference between one set and another. I’m still getting good use from the 32” HD Samsung I bought six years ago for £250.
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