With the perspective of starting or owning a medical device startup, I would prefer an LLC. The inventor can assign their patents to their LLC. You can do the registration without an attorney, the filing fee for an LLC is only $100. “Once you’ve registered your LLC with the state, you can get an Employer ID Number (EIN) from the IRS, and get business bank accounts and business checks.” Another reason would be to avoid double taxation or having the company and the owner both being taxed. An LLC is also best for a startup is because the owners can protect their personal assets from lawsuits directed at the company. Lastly, when your startup begins to expand and grow, it can easily be converted to an S or C corp depending on the situation.

https://www.inc.com/john-boitnott/5-reasons-why-an-llc-is-the-right-structure-for-your-startup.html