WM vs. B2B Insurance for building a book generating $1,000,000 a year of take home

To keep it short, I just finished freshman year and am interning in the M&A department of a large insurance company that is buying out smaller agencies. I am getting to see a ton of cool deals go down, as well as learning the sales side of how important producers are for insurance companies. My company does 35% commission on books, so a $3 million dollar book has someone doing over a million in take home.

I have also networked with PWM and seen how lucrative it is, especially private banking, to start in. Also being a grindy sales business to build a book, I am searching for insight on how long it takes to build a crazy book that brings home a million a year. Is it harder or easier than insurance? I know insurance is pretty tough, so that is why I am weighing some options.