There is no singular answer to this question. Some streamers will use boom arms provided by their sponsors; others will simply buy one that they believe will help them in creating their content.  It also depends on the type of stream they work on, as some streamers will need different types of boom arms than others or arms of different sizes. The type of boom arm used by a streamer is mostly determined by its practicality. As such, you should look more into the environment of your streaming studio before choosing one of the boom arms on the list.  Alternatively, the boom arm used by your favorite streamer might not be the right one for you. You shouldn’t buy such an important piece of equipment based on affection.