Well they are easier to drive, but they do cost a little bit more to buy. A semi-automatic car is based on a manual car with an automatic selector so be careful of rolling back on hills. They don’t tend to be as smooth to operate like a fully automatic car, i.e moving or reversing at slow speeds.
Most people that have a full licence in an automatic car will choose to stick with an automatic car when they get older simply because they put less strain on your left leg and less to worry about.