Your question, "How do you build massive wealth the fastest? may not be a question you should be asking yourself at this point in your investing career. I could be wrong but I am assuming you are relatively inexperienced simply because of the nature of the question.
Instead of asking "Which strategy should I do?" I suggest you ask yourself a more fundamental question. That is, "What would I like to do to build my real estate business?" Because if you hate doing a strategy even if it works well for you, you won't do it for very long. Real estate, whether flipping or rentals is a long term game. You have to position yourself to be in it for the long haul. Once you've picked a strategy you like, THAT is where you're going to make the "massive wealth the fastest." You have to like, (hopefully love) what you're doing.
You should educate yourself in both strategies. Start doing one or maybe even both to see which one you may like to keep doing!
To quickly analyze both strategies you asked about, flipping houses is a J-O-B. There's no long term growth, there are no passive returns. There are high taxes. When you're done, you've got to do it again. I know, I flipped houses in the early 90's before it was cool. I was pretty good at finding, rehabbing and flipping them. Flipping works as long as you are working at it, and working at it, and working at it. And for a select few it works fabulously well. Being ADHD helps. I am not ADHD. I hated doing flips even though I was pretty good. I made large chunks of money periodically. But over time it all vaporized. When you stop doing flips, your money goes Bye Bye. It's kind of like what Arkhad says in The Richest Man in Babylon. "A fat purse quickly empties if there be no golden stream to refill it."
That being said, I shifted to rentals with an occasional flip from time to time for some cash infusion. I would even build a modest house to sell or even to rent. I still own one of my small house builds from 1998 free and clear. It's been rented out ever since. Properly managed rentals give you, 1. Cash flow, 2. Debt pay down, 3. Appreciation. 4. Depreciation. I love the passive income every month. So for me I love to do what gives me relatively hassle free passive income every month and that's rentals. Sometimes my wife and I travel for months at a time. Actually we could travel indefinitely now. But I could never have gotten to the point I'm at now by flipping houses.
So going back to my fundamental question; What would you like to do? Only you can answer that one. Try both strategies and in a few years you'll know the answer. It will very easily come to you.
