Both are mining distributions for Ether. GenEthOs is free, EthOs is not. Both are based on Ubunut.
What's the difference between EthOS and GenEthOs?
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GenEthOS support usb, hdd, ssd and wi-fi ) preinstalled proxy and genoil miner
GenEthOS Portable platform for Ethereum mining The way the OS was designed by a miner for miners in the first place for those who see all perspectives decentralized platform Ethereum
ethOS is a 64-bit linux distro that mines Ethereum out-of-the-box. ethOS is for large-scale deployment and its not free.