Almost all sites are similar, but they differ in the sources of data and how they are analyzed and presented, but if you are looking for a site that contains the largest possible number of cryptocurrencies, or almost all of them, with an attempt to verify the accuracy of the data, then
https://www.coingecko.com is the site you are looking for.
If you want more accurate analyzes or strategies, they are available for a few cryptocurrency pairs and here is tradingview.
It is not the best Bitcoin price tracker, but it is the most comprehensive.
They have a similar goal but as you mentioned, their data's are not the same. I think CMC is the leading among all so they have a larger database but in terms of honesty or accuracy, I can also go with Coingecko. I saw someone above mentioned Coinpaprika. I already tried this one and what is great about them is they can list tokens or coins that are not found in Coingecko and CMC, or those coins that we can mostly get when we apply and work for a bounty and airdrops.
Well, I guess that's because their listing fees are only cheap. It was a useful site after all to know the price of our coins and if where they are listed, or if it's now time for us to disposed them. But maybe some has a potential and are worthy to hold on. They may get listed on better tracking sites and exchanges later on.