There are lot of different between bitcoin and ethereum. They are totally different crypto currency with different value. The working sector of both coins are different. Ethereum is a currency that accept most of the coin supported.
Yes both of them are not same, when we talk about bitcoin so something profitable and safe comes to my mind but when I think about ETH something investing long and less profit comes to my mind, if we compare both for holding and getting output will make us see how different both of them are, if bitcoin is sky them ETH is earth, for me between bitcoin and ETH are totally change.