bitcoin core, or bitcoin cash?
OP, I want to make this clear. There is no such thing as a coin called "Bitcoin Core" if you are talking about Bitcoin. Bitcoin Core is Bitcoin's software repository.
But there is a "Bitcoin Core coin", BTCC, the original chain from where Bitcoin Cash forked from.
https://thebitcoincore.org/I suppose OP had in mind Bitcore (BTX), because ticker BTCC on coinmarketcap show only some exchange with the same name, although Bitcoin Core coin have same ticker. Anyway both coins have very little value and some perspective in future.
New users often can be be misled with so many "bitcoins", but majority know that only one is the first and the real - just look at prices and all doubts should disappear. I do not see the meaning in the statement that some others alts-bitcoins can hurt to much real
BTC, or that will be the reason for total collapse.