This is a very tough call when you're making enough money to really be viable, but aren't really rolling in the dough....
I switched from sole proprietor to S-Corp for 2016. One thing that was a tough adjustment and learning curve was having to deal with a payroll processing company. They wouldn't jive well with where I have my retirement accounts, it was hard to shut off the solicitation emails from them, they messed up a couple things and I had to pay my CPA to fix the way the contributions were designated. As someone with no employees who finds it hard to find independent contractors competent to do any of my tasks (common in my industry, really....) suddenly it felt like I had some idiots to manage.
That said, it has been a great tax benefit compared to the hassle factor.
And, it wasn't any benefit to me the first 5 years I was in business. It made more sense for me to just deal with SE tax up to a point, and the overhead was simpler. Not anymore.
If you're new to business, or this particular business is new, I'd just start out as a sole proprietor but keep a close eye on your earnings and work closely with a CPA to know where you are, since there are deadlines for electing to be an S-Corp (I can't remember what it is).
I'm not a CPA so this is not tax advice.