CMC and coingecko both very useful for us, i used to use both however i am confused why many coins and tokens not listing in CMC but listing in coingecko, not only coins and tokens but also many exchanges, is this because coingecko become more popular than CMC, or for something else.
CMC used to list everything, but it became a metric scammers would use for legitimacy, so they had to change their rules to make being listed harder
They made it so certain requirements like daily volume had to be met before listing of a project.
This left a hole in the market where alot of coins wanted the legitimacy, but lacked the requirements to be listed on CMC, and so sites like Coingecko were born
Its that simple really. Which is better? who knows, as long as they both have the same accurate information, who cares you know?