Llc or sole proprietor

I am a hairstylist, and I am wondering if there is any benefit of becoming a single member LLC, over a sole proprietorship in terms of paying less taxes?

 

im currently a salon owner as a member of a 3 person LLC, and we get some QBI deductions . I am dissolving this business and going solo next year, and wondering if and how I can get QBI deductions.

 

and lastly, does a single member llc or a sole proprietorship have to file business returns?