I like this tile's configuration very much:
This was the first tile that came to mind when I read the subject of the post. I too really like the configuration; just two fields is a neat twist. As well as the aesthetics and game play this tile also represents Carcassonne as a whole for me; 2020 was definitely the year of Carcassonne for me. I bought most of my collection that year and this tile was the 'seal' on my collection.
Another tile that I really enjoy is the C2 Labyrinth. I think the crispness of the detail (on the original tile, if not this low resolution image), something it has in common with the 2020 Spiel tile, is what makes it stand out for me.