Bitcoin Cash has cheaper transfer fees (around $0.20 per transaction), so making transactions in BCH will save you more money than using BTC. A BTC transaction can cost around $1 USD per transaction, although it previously went up to around $25 per transaction!
BCH has faster transfer times. So, you don’t have to wait the 10 minutes it takes to verify a Bitcoin transaction!
BCH can handle more transactions per second. This means that more people can use BCH at the same time than they can with BTC.
All these changes are due to the fact that a Bitcoin Cash block (in the blockchain) is eight times bigger than a Bitcoin block. This makes BCH faster, cheaper and more scalable than Bitcoin. Bitcoin cash is becoming more and more adopted by the day because of this.
There are other arguments too, but these are the main ones, and researching them thoroughly and understanding the issues made me lose all my doubts about Bitcoin Cash and all my faith in Bitcoin.
It can't be any more clear to me now that Bitcoin Cash is the true version of Bitcoin, the real vision of Satoshi and the genuine implementation of it, with all the technical genius-ity that Satoshi had laid out in the whitepaper which is still relevant.
Security Differences
Another important difference between Bitcoin and BCH is the relative security of their blockchains. While both coins use the same algorithm (SHA-256) for mining, meaning that the same ASIC mining hardware can be dedicated to either coin, Bitcoin has substantially more mining power dedicated towards its chain. The crypto site estimates that the hourly costs to 51% attack Bitcoin is slightly over $1 million, whereas the cost for BCH is only $32,457.
In other words, Bitcoin is a lot more secure (perhaps 50 times or more?) against network attacks than BCH. This means that Bitcoin is a more secure store of value than BCH, as it’s backed and protected by vastly more mining equipment and electrical energy.
While BCH’s hashrate is obviously much less than Bitcoin’s, it is nevertheless much greater than the vast majority of altcoins. This suggests that BCH’s position around 4th or 5th place in the cryptocurrency market cap rankings is justified by the security of its network. That Bitcoin mining power could be easily switched over to BCH to either support or attack it perhaps serves as a caution to both coins against reckless actions.