We believe in giving you the full information.
Generally, a pendant is the safer option.
If you were to have a fall on your right side, or some other event that prevented you from using your right hand, then you will not be able to press a watch on your left wrist, (and vice-versa).
Try it - it’s impossible (unless you have a very tough nose!)
Having said that, some people do not like wearing pendants and the watch may be the only practical option. Some models are also available with a belt-clip.
The FirstCall “Home Safe” Medical Alarm can be supplied with either a pendant or a watch trigger - you will be asked for your choice during checkout.