Had one $90k rental, and one $50k rental. How much time and bandwidth can you dedicate, if time allows i'd do three $30k houses over one $90k. Depending on how you manage, one renter could take that $100k house down to a $50k house pretty quickly, neighborhoods, who and how you rent, verbal vs. tight contract.
Sued to get $4k back to one with a decent job, took 2 1/2 years roughly at $40 a week from the courts on wage garnishment. If you have multiple empty then that multiple payments and/or yards to mow, taxes, etc. Still have the $50k rental, sold the $90k in the good market going now for $35k in equity. You name it, it will happen you have multiple house you'll have to be ruthless, you could have one with no A/C, one with a flooded basement, and one sitting empty. Plan on having a lot of liquidity, sucks having roll out $5k on a house you don't live in while someone's paying $700 a month in rent, and your cash flow basis is off.
Other guys are right if i had an ideal situation it'd be duplex's, or apartment buildings. SPREADSHEETS