What is the biggest dex?

I'm curious, when it comes to decentralized exchanges (DEXes) in the cryptocurrency space, which one stands out as the largest or most significant? Are there any metrics by which we can determine the size or influence of a DEX, such as trading volume, number of users, or the diversity of tokens available for trading? It would be interesting to understand the factors that contribute to a DEX being considered the 'biggest' in the industry.