I think regrettable that Bitcoin cash will replace Bitcoin in the future (1-2 years), at least in price
Bch cash is an improved version of btc, and has 8mb blocks, in the future, if cryptos uses in day of day of real life, btc isn't optimized to make so transactions per second, and i'm afraid.
In terms of block capacity, Bitcoin Cash is indeed bigger than bitcoin, but to replace bitcoin I don't think it will happen because even though there will be no BCH if there is no BTC.