In addition to a lot of what has been said, being able to have multiple apps open at the same time and switch between them quickly (Switch quickly between Apple TV apps) is huge.
Saves so much time over Roku or other platforms when you have to completely close out an app and start over from the main menu. Switching between content (including live streams) in different apps is easy and quick.
It’s a good time to find out! Apple’s holiday return policy is in effect. You can return up until January 8 if you don’t like it (https://www.apple.com/shop/help/returns_refund).