Bitcoin is blockchain 1.0 and limited Supply = 21M BTC (now about 17M mined)
Etherium is blockchain 2.0 with another mining algo (for GPUs not ASICs), programmable language (solidity), smart-contracts but unlimited Supply (now about 100M ETH mined). ETH's developres are planning to upgrade it to Casper Protocol with POS-POW mining in near future.
The network updates that Ethereum uses are more open to innovation and more scalable. So in summary I think that the blockchain structure that Ethereum has used will be used more in future.