Compare the latest Apple Watch models including Series 8, Apple Watch Ultra and Apple Watch SE. 44mm or 40mm case size. 45mm or 41mm case size. 49mm case size The Watch is lightweight at just 27.8g without the strap for the 40mm model and 33g for the 44mm. I soon forgot I was wearing it (in a good way), and it is small and discreet enough that I did not mind sleeping with it on to track my sleep, but it’s not as slim or subtle as a thin activity tracker such as the Fitbit Inspire 3. Here’s a quick cheat sheet, if you don’t know what to go with: If your wrist circumference is 6-7 inches – you have a small to medium wrist. Look for small to medium diameter watches of 38mm, 40mm, and 42mm. If your wrist circumference is 7.5 to 8 inches – you have a larger wrist. Look for watches with a diameter of 44mm, and 46mm. 40mm is a timeless size when it comes to traditional watches. A more modern approach to sizing is 42-46mm range. I agree with others that have said it, it comes down to whether you value the wrist presence over functionality or vise versa. Very interesting choices from Apple this year regarding case sizes as I think either of them can be a solid cho Apple Watch Ultra 2 was designed for endurance athletes, outdoor adventurers, and water sports enthusiasts who need long battery life to compete and explore. So we optimized every aspect of Apple Watch Ultra 2 for battery life. And because everyone will use Apple Watch Ultra 2 differently, we tested several other metrics as well. Mine’s 145mm, and I get the smaller versions (so far S3 & S5) the larger one looked ridiculous on me. Like an iPad stuck to my arm. The larger sports bands are too big for me on the smallest hole. I pass my watch onto my wife who has 140mm wrists.. so yeah, don’t stress it. The smaller version is plenty big enough. i agree with Oleksi. the watch in yr posted pics is almost too big already. but it does also depend on what you are after: a huge watch on a smaller wrist can look great if you are the kind of person who can wear almost anything and still look good. the watch you are wearing in the pictures shouts: geek ! which is fine if thats what you want to be shouting. otherwise, choose the smaller one Amazon.com: Apple Watch SE (Gen 1) [GPS 40mm] Smart Watch w/Silver Aluminium Case with Abyss Blue Sport Band. Fitness & Activity Tracker, Heart Rate Monitor, Retina Display, Water Resistant : Electronics MKp3.