When I started to use make up, I did not even know what a highlighter was, I discovered highlighters only 2 years ago but since then, I use them on a daily basis, either in a subtle way for a day at work or more dramatic for other evening events or parties.
I love both powder and cream highlighters but due to my very dry skin I tend to use the cream ones more often. They also make it more easy to travel with since they are not powder, they will not shatter and you can just keep them in your checked luggage.
I find cream highlighters more long lasting and that is also why I would pick a cream over a powder one.
Whatever your reason is, everyone should give them a try as they really deliver !