Ethereum
Ethereum is a block chain based decentralized open source platform initially released on 30 July 2015.providing Turing complete virtual machine, The Ethereum Virtual Machine (EVM). EVM provides scripting facilities using an international network of public nodes. It provides crypto currency token called "ether" that can be transferred between accounts and used to compensate participant nodes for Computations performed. Ethereum platform is x86 bit written in C++, GO and Rust and is licensed under GPLv3, LGPlv3.
Ethereum is a true outliers .Its platform allows creating smart contract that runs on decentralized network. The degree of adaptation that gets at the moment is phenomenal. It is the crypto currency that has the most potential. Nowadays, it already grew 1000% over the past few months and can see the currency go another 1000% easily. The current market Cap is about $816,840,800
Bitcoin
Bitcoin is the first decentralized digital currency which was introduced in 3 January 2009. It is a crypto currency and worldwide payment system which was released by unknown group of people as open source software which uses peer to peer communication technology so that the transactions take place between users directly without an intermediate person. These transactions are recorded in distributed ledger called Blockchain. Bitcoin has proven a store of value over the past few years. Bitcoin have a unique process called mining which can be exchanged for other currencies, products and services .Due to this features, its doing great job in the field of digital currency. The current market cap of Bitcoin is about: $6,275,855,360