Recently, there has been a controversial topic by a lot of people about whether choosing the friend who more capable of having fun or the one who will help you when you are need them. From my perspective, I still regard people who can bring pleasure to you as important friends for our life im many aspects. 
In the first place, being fun and being happy will raise positivity which will naturally make a person more productive than who brain operation under negative. Recent research has pointed out that people,who are happy at work, are better performers,have closer relationship with their colleagues and more open communication with managers. For example,the difficulty of the project make people so depressed and feel diffident,if friends come to tell some funny things with him, he probably cheer up and pick up his confident to acccomplish the project. In such aspects, it seems that having the emotion of ethastic plays a vital role during the work. In addition, people who have fun together may have same interest, possible so they have more common topic to communicate and pursue a same goal. They are support each other,go together with their achievements. 
What's more, having fun also trigger healthy physical change in the body. Laugher and humor can strengthen immune system, boost energy, diminish pain and keep people from pressure. When people feel stessful or depressed, friends bring something interest to them, they may recover faster than without fun. Sometime the fun is priceless medicine, free and easy to use. In this sense, choosing friend with fun should have priority among people, who need better lifestyle, less stress and greater health condition. 
Admittedly,friends who help you when needed could bring enormous and direct benefits to you. However, people would always confront with difficulties, thus the friendship might only appear for a short time. Keeping fun in life is a key part of keeping happiness alive when facing stress or adversity.