Sounds like you are looking for a business coach or branding specialist. As I am sure you already see that what you really need is for someone to come in and explain all available options and how they stack up. In all honesty, no two businesses are alike, so what you will need to do is to look at past track record of the consultant.

My advice would be to find other similar business models and understand how they work, what may be their advantages and disadvantages. Don't be shy to reach out to other owners or executives through LinkedIn, you would be surprised how many of them will be willing to share their experience.

Also, rather than hiring an expensive consultant, maybe it's worth finding an adviser or mentor first and do some due diligence, so that when you do hire someone, you will know exactly what to ask.