Why use Uniswap instead of Coinbase?

I'm curious about something here, why would anyone choose Uniswap over Coinbase? After all, Coinbase is a well-known and established platform with a user-friendly interface and a reputation for security. Uniswap, on the other hand, seems to be more technical and geared towards decentralization. What advantages does Uniswap offer that Coinbase doesn't? And why would someone who's new to cryptocurrencies prefer Uniswap? I'm really interested in understanding the differences and why one might be a better choice than the other.