For me, the biggest benefit is that the Catholic Church possesses the truth and I think that is directly related to the fact that it is the church created by Christ 2000 years ago.
I’m a lifelong Protestant. I’m also a historian. I naturally started to dig into the history of the Protestantism, and what I found has lacking. Protestantism is very wishy-washy. You go to one church and you hear something totally different from the next church. Everyone has a different notion of what spirituality is. About how salvation is obtained. About what it means to live according to Christ’s commandment. Or even what it was that Christ commanded. It was impossible for me to develop in my faith with so many contradictory instructions. I fell away.
So, further benefits of becoming Catholic are consistency that comes from scripture, tradition, authority and faith, a more authentic connection to Christ, clearer sense of purpose for living and a richer spiritual life.