Some opinions: Ethereum suffers from a lack of scalability for the present, and was brought to its knees by recent crypto-kitty fiasco. There are some ERC20 tokens that fund some interesting projects though (CVC, EOS, ..). BCH is moving because of being listed for first time on fiat exchange (Coinbase). BTC is still the brand, and core of the space for now. Best bet may be to hold both BTC and BCH, and I did increase BTC on the dip this week. As a currency, BCH is likely inferior long-term to some other projects, like Dash, Monero, PIVX, as the need for privacy and efficiency is central to long-term utility for a world currency. I think one should diversify among the best projects, including BTC, as opposed to all one or another.
RE: Could Ethereum be the big winner in the upcoming Bitcoin vs Bitcoin cash battle