Daniel Cooper for Engadget RATING : 8.9 / 10 Pros Better looking hardware Brilliant charging case Data-rich app Cons Pricier than rivals Not a quantum leap over what went before Depending on who you ask, Ultrahuman is the second or third biggest smart ring maker on the planet. Like Samsung, it's dwarfed by Oura , the undisputed king of the market. It's also one of a handful of companies capable of laying at least a finger on its far bigger rival's hardware and software engineering. The Ultrahuman Ring Pro is, depending on who you ask, an attempt to catch up with, or blow past, the leader. There is just one issue: Given the inherent limitations of the form factor, are there any new features that can be added that would offer a decisive advantage? And if so, what does that mean for the whole industry? Hardware Daniel Cooper for Engadget Ultrahuman's Ring Pro is a smart fitness tracking ring weighing between 3.3 and 4.8 grams (approx 0.1 oz) (available in sizes 5 to 14.…