Its good if everything you need can run from Kodi. It uses its own Linux distribution in the background, so you won’t really be able to install anything else unless you build it.

I would avoid anything built into the TV.

1. Its starting to be used for spying on you
2. The chip they come with are usually not that good unless it’s a high end TV.
3. They are building ads right into the TV themselves.

I would not connect the TV to the internet and use a external media player. Either a Nvidia shield or an Apple TV is your best bet.

You can also try building a media player yourself using a small computer.

Note - The self made media player will be more limited in terms of apps available, unfortunately, as well as streaming quality from some of the streaming services.

You can probably do some more advance tasks via CLI. Also usually lists information faster. But honestly you will be overall fine with GUI a majority of the time.

Some people just like being in the terminal.