Here are a few insights which will help you choose the right one.
Muslin fabric is made from 100% natural cotton, and is quite soft and easily dyed for any application. It’s typically pretty lightweight. It’s 100% all-natural cotton.
Seamless paper rolls are versatile for most any shooting space, offer almost 50 colors to choose from and are among the most cost-effective studio backdrop options available.
Here are some difference between Muslin & Paper
|Cotton Muslins||Paper Backdrops|