The Pixel camera is the one all others are being compared to - and its HDR+ mode still beats the S9+. (As a Samsung owner for years, I went with the Pixel.) You also get updates almost the day they're released by Google (sometimes on that day) - Samsung is notorious for late updates, or waiting a few months to combine a few fixes into one update. (I got my Pixel in early February, turned it on and it updated.)
About the only problem with the XL is the screen burn-in, but they've already addressed that. (I wouldn't go with the Verizon variant, though, if you ever hope to toot the phone or install TWRP or another ROM or kernel - Verizon locked the phone down. The Google model is the same phone, but it's not only open, Google has a couple of web pages, one for the entire ROM, one for the updates. Google has no problem with your flashing the phone, Verizon does. (And it takes less than a week to get it from Google. Time payments are about the same. No interest if you make all the payments on time. The only difference is waiting a few days - and having an unlocked phone.)