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.