Excellent query. Of course, it’s been posed myriad times over the years on the Notary Cafe forum. Thus, your answers await you in the Notary Cafe database! 
You can run a Search (upper right/magnifying glass) as it will probably be quicker than waiting for someone to reply.
Here are the results of the quick Search I found for you by typing “best companies” in the Search field:
http://forum.notarycafe.com/search?q=best%20companies
Take the time to review each url link on that page for information on your topic within the threads (on the page referenced above).
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Please know that each of us contributes our time-proven experience & expertise. We are very busy business owners; either working with clients OR marketing/developing our business.
It’s so important for each member to endeavor to perform due diligence prior to requesting the valuable time of other business owners.
Searching the Notary Cafe database for the answer (that’s more than likely already present) prior to creating a new thread or post is being considerate, thoughtful, & respectful of other members. Saves everyone time & prevents consternation.
Wishing you the best!
P.S. You may also find this link helpful: