TOP can be measured in so many different ways that it can be meaningless or meaningful. You've named two different areas only.
Brokerages will tout themselves as the top this or the top that just as agents do. Some of those top markers are organic and some are paid for.
My question back to you Tommy T is what about the top means something to you? Is it more important to work with a brokerage that sells the most mansions and therefore has the highest sales volume or a brokerage that has the highest number of transactions because they have the highest number of agents? How about the highest number of transactions per agent or the highest dollar value per agent? Is it important to work with a Trulia agent who pays for the "pro" label or someone who earns the "VIP" label? Do you trust Yelp even though they adjust the algorithm with paid advertisements?
Trust is the most important question here. Just about everyone says they are number one at something. Assuming that you are trying to find an agent to work with, it is still best to ask friends and co-workers for references and then interview them to find one that you trust, one that will answer every question clearly and concisely, one that you trust to represent you above themselves with honesty and integrity. One that isn't going to use you as a further stepping stone to being number one in some category!
Anyway what category of number one do you want, any agent can run you the stats from the MLS.