Great article which makes valid points on how the screen on the 8 plus is the biggest area wise. Also the lack of landscape mode features in the iPhone X is less features for more money. Some on the 7 plus may find the iPhone X a downgrade.
Read on - https://www.theverge.com/platform/amp/2017/10/23/16519388/iphone-8-plus-vs-iphone-x-comparison
Read on - https://www.theverge.com/platform/amp/2017/10/23/16519388/iphone-8-plus-vs-iphone-x-comparison