They have different feature sets.
Ultimately it depends on how much you want to spend. That's why Apple has iPads are so many different price points. For people who want to spend more, there are more expensive iPads.
Generally speaking, the cheaper tablets provide more value for money simply because they are cheaper, and they do the same thing as the expensive models. E.g software experience is the same, but other features are different, e.g. laminated display, no of speakers, refresh rate, Apple Pencil support.