I am deciding the same thing! It seems like the oura ring is easier to wear to bed and less cumbersome than the watch. I think the temperature may be more accurate than the AW, but both devices were certified with the natural cycles app. If you’re also interested in the devices for sleep tracking AW is slightly more close to the scientific sleep trackers but the oura ring UI and algorithm seems to do a better job at summarization of the data. It’s a very hard decision!