Watches are incredibly individual. People choose them for a variety of reasons that may or may not make sense to someone else.
For me, one important feature is readability. How easy is it to check the time at a glance? Can I see it with my glasses off? This is something I think about. A light in the face is a nice extra.
For older ladies, a watch that goes on and off easily is another consideration. For someone whose fingers aren't as deft as they used to be, dealing with a clasp or buckle may be a problem. The solution to that is either a bangle watch that looks like a bracelet, or a stretch- band watch that just slides on and off.