What if aliens are smarter than humans?
I think you are asking what if aliens that visit the Earth are smarter than humans. First, I do think they have to be smarter, or at least more advanced, as space travel is so difficult. Humans have only made it to the moon. Mars is something we hope to do. But the planets nearest Earth that might have life like our own are millions and millions of light years away. If they have the ability to somehow over come those vast distances, they are smarter than we are now!
Stephen Hawking, the great scientist, says that people on Earth should not be sending out signals and trying to reach life in space. He thinks if aliens ever visit here it will be like when Columbus came to America! New diseases, enslavement, invasion, no respect for our culture and our property... it would be a disaster. This is just his opinion, but many people agree with him. Others think perhaps the aliens would be so advanced they would not have war and be very peaceful and teach us how to live our lives better.
I think we will never know until aliens visit and make themselves known to us. But no matter how the aliens treat us, if they are able to visit us here, they ARE smarter than we are.