I have a 6 inch wrist, 7 inches where I wear my watch, I’m a female and I purchased the 44mm, it’s not too big at all, almost the same size as the Fitbit Versa I hadDespite saying i go for 44mm i think i will fit them on my thin wrists when they are available in the Apple store.
Battery life etc will not be improved based on the battery test done in the past with the S3 models.
I hope slightly better LTE reception with the bigger ones but reviews/tests hopefully will show that to us soon.
I am a bit afraid 44m will be bigger than my entire wrist or just barely fit and then having the straps stick out making it look ugly when wearing it. A bigger screen is awesome though but if it dances around on my wrist because its too big than it the bigger screen will not be a pleasant daily wear experience.