Which laxatives are best?

How do I know which laxative is best for me? If you have the choice between bulking agents, osmotically active laxatives like macrogol or lactulose, anthraquinones, lubricants, etc.

There are elderly people, people with illnesses, people who want laxatives as a precaution, but how do I know which one to choose?

Example: A woman wants to travel, but she knows that she will get constipated during the trip and wants to be on the safe side, in case of an emergency, a preparation that works quickly and reliably

which one do you take?