I think you're quite confused when comparing ETH with BCH (after renaming). Because BCH is one of BTC's hard fork, and ETH is going the other way. They are a platform for startup teams to build dapps on their smart contracts
ETH is the best altcoin so i am very confident that it will remain the best among the rest of altcoin and no one altcoin can beat it, investing on other altcoin is also a good decision but eth will be have more bright future than to other alts.