Hey Juan,
Kinda of a loaded question but ill do my best to help out. When it comes to primary residence we also need to consider quality of life, and what you personally feel comfortable living in. For some that may be duplex, condos, or SFH. Next, in regards to a loan, your going to struggle finding a traditional loan in regards to building a complex. This will also have other concerns, such as building costs, holding costs. A majority of which will have to be in cash/ or from hard money/ building loan. Condo's are an option, but often come with high HOA.
Another possibility could be single family, condo, townhome, and house hack per room if you feel comfortable doing so. This not only provides cash flow, but goes directly towards many peoples main expense (their primary mortgage.) I hope this helps clear the muddy water. Cheers
