I am late here because I have been travelling but I wanted to chime in and say I've had an. Apple watch -- the very basic SE model -- for several years now and it has a VERY sensitive SOS function that will call for you if you fall. It seems to think I have fallen whenever I gesticulate too wildly or make a big chop with the pruning sheers, but you can tell it, no I did not fall, and it backs off again.
I don't care for the look of mine compared to my lovely regular watch but I do love its functionality. It counts steps, clocks various kinds of exercise, including swimming, walking, hiking, biking, and also energy expenditure and does all kinds of things I don't really use. I've made calls on it and sent texts/ emails. And I like changing out the straps. The battery life on mine is kind of awful but other than that, it has been a good purchase.
It DEFINITELY worked when I had my bike accident. A car crashed into me, I fell over, landed hard, and it SOS'd itself like crazy. I did turn it off because I had helpers there already, but had I been alone, an ambulance would have been with me pronto.