I prefer Coinmarketcap because it has everything I need and working well. I have been using it since years back and I am pleased with the information. So, I dont think I will switch to ForbesCrypto for the time being.
CMC is so simple and that's why a lot of people are interesting in using it. Forbescrypto is a new marketcap site but there are some improvements on it. But remember we have a lot of marketcap sites like coingecko and any other site but they are offering the same thing.