Currently PancakeSwap is the largest DEX in the world after surpassing UniSwap. Causes come from:
+ The development of the Binance Smart Chain ecosystem, many projects have been built on BSC;
+ Transaction cost on Pancake is cheaper than Uni, because BSC's speed is higher than Ethereum;
+ Users want to seek new opportunities with DeFi on BSC.
I have not used Pancake yet, but if Uni's transaction fees continue to reach above $100, I will probably be forced to transfer my investment to BSC.