I would caution against an independent "Advisor" whose role is to represent a client and recommend a Broker or Lender.
The reason is simple, and was referred to in Barbara's answer. Because Reverse Mortgages are HUD/FHA products, they are highly regulated and their is little difference between the actual offerings of one company versus another.
This "extra Advisor" would have to be paid, and I don't think one would gain much benefit from the additional cost.
They KEY DIFFERENCE between providers is two-fold :
1) The company and type of company involved.
My recommendation would be to work with a smaller Bank that has their loans serviced by a larger entity. This gains you the advantage of generally the best service, which a smaller institution can provide while you are obtaining the loan, PLUS the security of a larger institution for the longer term.
Brokers can and do provide good service and are also subject to regulation. However a Banking entity has a lot more to lose if regulations are not followed, and is much more highly regulated in total than a Broker.
2) The person involved (employed by the company). Again, Banks have an advantage here, because their requirements for employees are more strict.
Key questions are how long your particular Advisor has been working with Reverse Mortgages, and what percentage of time and effort do they spend with this product.
A very good choice would be to work with a Company (or Division of a Company) and an Individual who specializes in Reverse Mortgages.