Bitcoin is a store of value. Ethereum and some of the other alt coins actually do something. There is an entire financial network built upon Ethereum. There are thousands of ERC-20 tokens which can be held in Ethereum wallets. Smart contracts are what allows you to stake money on chain. Smart contracts are what allow you to add liquidity to Uniswap and earn a commission. Some thing with Compound and AAVE. Smart contracts are codes on the blockchain that bind multiple entities by forcing the movement of funds when required.