What is the difference between Uniswap and PancakeSwap?

Can you explain the key differences between Uniswap and PancakeSwap? I'm curious about the unique features and functionalities of each platform, as well as their respective user bases and the tokens they support. How do they differ in terms of trading volumes, fees, and security measures? Is one more suitable for a certain type of trader or investor than the other? And what about their interfaces and user experience - are they both intuitive and easy to navigate?