Well they are more efficient and they do last longer. No brushes to wear out, they are lighter than their brushless equivalent and give you more power when needed most.
Other than that they are pretty much the same! lol
If what you have is working for you then great! Leave it the heck alone. Now if you burn out the brushes on that motor and need to replace them you may have a hard time finding parts. Not much is sold for brushed stuff nowadays.