Buy & Hold vs. Flipping | Give me your thoughts

For some context, I purchased a duplex last August (2018) as a buy & hold with about $300 of cash flow per month. As I've been learning and developing some interest in the BRRRR method, I became intrigued with the possibility of flipping, but wasn't sure if one is better than the other as far as what you actually walk away with in, let's say a year.

The way I'm looking at it, if I flipped 4 houses a year with $25,000 profit each, I'd only need to flip 4 to get to my first annual financial goal of $100,000/year (which I'd obviously have to repeat annually to continue that method). With buy & hold at $100/unit (average cash flow), I'd need 84 units.

Would love to hear your thoughts on the pros and cons of flipping vs buy & hold [with or without the BRRRR method].