This question is often asked "What are the benefits to having crepe paper rather than regular tissue paper?" Good question.
Most people don't know the difference between the two materials and so they choose based on the look of the paper rather than the condition and quality of that particular material.
So, for a little education, here are the differences and benefits to having crepe paper over regular tissue paper streamers.

• Composition of Crepe Paper: Crepe paper is tissue paper that during the process of manufacturing has been "sized" with specific substances as a protecting filler or glaze, but then is "creped" to create bumps or gathers in the tissue paper.
  The sizing is used to change the absorption and wear characteristics of materials that use this specific process.
  It is a material such as glue or gelatin, gum or starch added to the paper pulp to create stiffness and add sheen etc.
  And in return the creping and sizing gives the tissue paper a distinct texture and different feel from the normal tissue paper that is used for regular streamers.
  So, because of the process, it opens unlimited choices and things you can do with crepe paper that you wouldn't choose to do with normal tissue paper.
  A whole brand new broad range of unexplored uses.
  
• Other Uses: A few of the most popular uses for crepe paper streamers are as follows: used just like the normal streamers to help decorate and enhance the room for your party or other occasion (just with a different look and design), it is used to make paper mache flowers or any other kinds of paper constructions, to dye Easter eggs (an odd idea but works like a charm) etc.
  With these extra uses, it becomes an essential need for your home and who knows, you might be able to find a use of your own for the crepe paper streamers.
  
• Stronger: Because of the composition of this odd material, the paper is stronger than regular tissue and therefore gives quality and strength to the paper.
  Of course it can be ripped, but if it didn't have the composites than it would be very difficult to work with.
  The regular tissue paper would rip very easily and wouldn't be a top choice to decorate with because of the headache it would give by decorating for hours and hours.
  Because of the process in which the streamers go through, they make a wider and broader span of uses for your everyday crepe paper streamers and also an easier task to accomplish with ease and in a very limited amount of time.
  

So the thing is, is if party throwers were to choose to decorate with the regular tissue that hadn't been worked and processed in the way it needed to be, there would be a whole lot more headaches and most likely a different material would be used to decorate and spark up a room for a special event rather than the very common and "must use" material of the crepe paper streamer.