I want to pursue a career in fashion photography and I was wondering which backdrop is better to use?

Is a white vinyl backdrop better or a muslin backdrop?

That really depends on the lighting that you use, what you’re shooting, and what look you are after. There is no one solution to taking a style of photography. Everything used in photography has a purpose and is used for something, nothing is absolutely best for something. Its about being creative and finding what works best for the look you’re trying to achieve.

Photography Tips : How to Make Backdrops for Photography