Hey @Max McQueen!
I loveeee where your head is at! You're wanting to get into some great strategies. The small multi-family and MTR approach can be a good one. If you house hack either, then you can put yourself into an even better wealth building position.
4-PLEX IDEA
If you find a four plex in a good area for a reasonable price point, then you can leverage a low down payment option if you were to house hack. You could live in one of the units and rent out the others either LTR, MTR, or a mix of both. Maybe you could move into one, rent one or two as MTR, then slowly transition all of the units to MTR if you've seen success.
IMO, I think a 4-plex with smaller units can actually be a great MTR opportunity. It seems like traveling professionals, many interns, and even other professionals are tending to look for smaller spaces if they are traveling alone. For example, if you have a 4-plex with all 1/1s or 2/1s, then maybe you can nail their price range and be booked consistently.
SFH/Duplex as MTR
This is actually what I'm doing right now. We bought a duplex to house hack and MTR/STR the other unit. I love this option, because you can leverage low down payment, get benefits of real estate, learn a lot of valuable RE skills, and can maximize your income with a furnished rental.
As a SFH, you could potentially rent out rooms or an additional space out as MTR/STR, but there is potentially less privacy. I think that is a decision based on your situation & goals.
I'm not sure what your market rates, prices, or demand are, but I'd suggest analyzing both of the strategies you mentioned and see what numbers make the most sense. Go after whatever ROI & NROI math out the best! Haha
Good luck @Max McQueen! Keep us updated on how things go and please feel free to reach out with questions or to chat RE.