You need to do what is best for you based on your own goals in your own strategy I would caution you from asking other people their opinions until you have a clearly defined goal and strategy of your own
Remember that their information could actually put you in a worse position because they're giving you their goals and their strategy based on what they would do not based on what's right for you always be careful of asking other people their opinion
First thing I would do as others in here have stated is figure out "WHY" you are doing this. Once you know that and you know your end goal then you work backwards. The goal has to have a finite destination and time limit on it.
For example you may say your goal is 20 houses in 20 years (paid off) earning $20,000 per month.. (20,20,20 goal).
Now you know where you're going and the timeframe for this to happen. From here you can build out your strategy, for example here you would want to have the 20 properties purchased the first 10 years so that they can use the final 10 years to pay themselves off. This means that you have to buy 2 properties per year which means you have to close on a property every 6 months which means that you have to find a property in 3 months to have it on the market and rented the following 3 months.
And the properties need to have a final cashflow of $1,000 per month after all expenses are paid. This will dictate where you purchase and look for properties based on that number alone.
My point is that you always start with the end in mind and work it backwards, this creates the strategy (Buy and hold, flip, Wholesale, Notes) which will be driven by the tactic (SFR, MFR, Mobile homes, Short term rental etc)
I always coach people and explain that the property is actually the last piece of the puzzle not the first.
Hope this helps