the KMD translation is long, the block time is 60 seconds, the ETH is 14.  New technology, vulnerabilities can be opened, but the ETH was time-tested . KMD is no application in practice, but the ETH is widely used. To protect against the attack of 51 Komodo uses bitcoin blockchain, but ETH is independent of bitcoin and has good own protection. To protect the KMD private key from the network, you need to enter a complex command in manual mode, but the ether has a convenient myetherwallet shell in offline mode