Of all of the reviews of the Apple Watch Series 3 cellular model, this is the best that I’ve read. It looks at the Watch from the point of view of athletes, fitness fanatics, and just regular people, and had good examples of performance and battery life.
https://www.outsideonline.com/2242621/testing-apple-watch-series-3
https://www.outsideonline.com/2242621/testing-apple-watch-series-3