Yah set to 4k, thought that was the best way now
Keep in mind the Pixel XL's screen isn't even 4K, and most people's TV's and computer monitor's aren't either. Consider the end usage of the video before switching to 4K (don't get me wrong, it's great if you can actually use it), but also consider that at least today, most people don't even own a display of any kind that can natively display 4K. The files get pretty huge pretty fast. With the free unlimited storage at full resolution though it's not a big deal either way.