I am Catholic because the Catholic Church is the original church founded by Jesus. As someone else mentioned, there has been an unbroken of succession of popes tracing back to St Peter. This is history.
I am not sure if Protestant churches could easily claim to be apostolic, since they were only established after the Reformation, long after Jesus was on earth.
We also have Jesus!

So do the Protestant churches, of course, but it is in the Catholic Church where we are able to receive Him body, blood, soul and divinity in the Eucharist. If I knew I could be that close to Him, why wouldn’t I be Catholic?