Looking at a lot of battery review articles, both versions are really good, and it seems that the Pixel 2XL has 1 more hour of battery life overall when it comes to continuous web browsing. That's really good. Despite the washed out look and blue tint which shouldn't be a big deal to most people, that would definitely make the Pixel 2XL worth it, along with the 6 inch screen and 4x resolution.
Man I ordered a Pixel 2 and a Pixel 2XL though, with the Pixel 2 at 128GB for the price of Pixel 2 64GB on ebay and the 2XL from google store. Truth be told, I was thinking about cancelling my Pixel 2XL order, but now I'm gonna give one to my mom. She's not gonna use anywhere 128GB of storage though, but that extra battery life on the 2XL though.. shoot. Makes my nearly 4 year old Nokia Lumia 1020 on 2 hours of web browsing from 100% to 0 a joke. lol I guess I'll have to see how both are. My 2XL will be coming next week, and the 2 should be coming 9 days from now.