I don't think btc is the only peer to peer electronic money, ethereum and other altcoins are peer to peer money too.
The basic difference between Bitcoin and Ethereum is the smart contract.
Ethereum blockchain has smart contract that we can use to build many apps such as defi apps.
Now almost all coins already have peer to peer technology, it's just that the number of uses is different, so the one that is used the most will always be more famous and also be better than the others, even though the technology is almost the same.