I was thinking up until about 45 seconds that the XB1 version looks better, but then the Switch version looks better from there on. Actually looking back over the first 45 seconds again, the Switch version looks better overall. I was focusing too much on the wool of the character, but the water looks better, it's brighter, clearer. That's the theme for the whole comparison. It's more colourful on Switch, background objects are more in focus, lighting is better. They've sacrificed some detail on Switch, like less grass, rocks,etc, less realistic objects in places, but overall it looks better.
I'm really surprised and very impressed, they seem to have done an excellent job. It's the first time I think I've noticed a Switch port of a multi platform game looking better. It doesn't look just better, but considerably so.