Bitcoin is an older technology, Ethereum was a 2.0 which added smart contracts, an idea from 1997 and Nick Szabo. It had not been possible to develop Nick Szabo's idea before Craig Wright invented mining (proof-of-work) for global consensus, which provided a medium where smart contracts could live. Both Bitcoin and Ethereum are quite outdated at this point, have a look at BitLattice if you are interested in the next generation,
https://steemit.com/informo/@johan-nygren/bitlattice-as-ethereum-2-0-and-how-sharding-required-a-new-state-topology