Hi @Anita Oakley ,
I definitely agree with Joel on the points of multiple SFH's being more of a headache to manage (and often more expensive per door). The upside, however, is that if you're in an area where neighborhood quality changes within very small areas covering multiple areas somewhat diffuses your risk. That, however, has to be weighed against the additional cost and time.
In regards to the development, Joel also hit the nail on the head with being able to control the development and final product. When larger companies convert, they typically create an HOA and control all of the seats until they sell a certain % of units and then slowly transition the control/management over to the owners. This way they can be in charge of the look to ensure the future buyers (or renters if they can't sell) don't adversely affect their efforts). If you're renting, this isn't really an issue for you but still something that you will want to keep an eye on in the market (as you would if you owned an apartment complex anywhere).
Finally, surprisingly a lot of people are willing to buy in a owner/renter mixed area. Homes like this are typically less expensive than all SFH neighborhoods which open up them up to a larger pool of owners.
Justin