Oura Ring 3 vs Oura Ring 4: I’ve tested both smart rings, and the winner is not so obvious

Considering buying an Oura Ring to track your sleep, activity, or stress? Oura is taking up to $200 off its third-gen smart ring, depending on the finish and size. This deal applies to the Oura Ring Heritage and Oura Ring Horizon, two third-generation smart rings. 

Also: I compared this subscription-free smart ring to my Oura and here’s how it fared

The deal on the earlier…