BTC wins on functionality for digital gold/store of value. BCH wins for actual payments due to lower fees and faster confirmation. They're different tools for different jobs.

Security wise, BTC absolutely dominates with way more hash power and network effects. BCH is more vulnerable to attacks due to smaller mining network.

Both can theoretically be controlled if someone gets 51% hash power, but BTC would cost billions while BCH would be much cheaper to attack. Neither has single entity control right now, but BTC's massive mining makes it practically impossible vs BCH being more realistic (though still expensive).

Your Monero bias is showing in that bio though. At least you're honest about privacy priorities.