The big difference is that bitcoin's scripting language is not turing complete. This is a security and scalability trade off that the bitcoin community isn't wi

The big difference is that bitcoin's scripting language is not turing complete. This is a security and scalability trade off that the bitcoin community isn't willing to compromise on, which drove people like Vitalik (started as a bitcoin dev) away to start Ethereum. Taproot is also a rad upgrade that is going to improve bitcoin's layer one scripting in some interesting ways, https://bitcoinmagazine.com/technical/taproot-coming-what-it-and-how-it-will-benefit-bitcoin https://bitcoinmagazine.com/technical/taproot-coming-what-it... I haven't looked into this much, but there are projects like Rootstock, https://www.rsk.co/ https://www.rsk.co/, that essentially recreate all of Ethereum's functionality as a bitcoin sidechain.