Residential vs Business Property?

I'm researching the most viable option between purchasing a small block of flats with a few units (4/6) to let or a small office block to let?

What are the in's & out's in these to industries? Have no prior experience in managing such properties. Looking at starting small and working my way up.

What are the pit-falls to lookout and how best can I ensure high occupancy?

I need to decide on the property to invest with between the two properties:

The residential block would be in a densely populated neighbourhood with a history of decay and prospects of growth are high since a rejuvination of the area is about to take sharp.

While the office block would be situated in a business district with a lots of empty office blocks, while all business support services like banks and other functional office blocks are nearby.

Both areas are within easy reach to Johannesburg City Centre which is still gaining momentum with regards to it's regeneration as big businesses are starting to return to the CBD which has been infamously known for crime and decay.

Your input would be greatly appreciated!