In most situations, short-term rentals will make more than long-term.
With long-term rentals, the level of required amenities is quite low.. With Airbnb, there is much more setup involved.
If you grow your portfolio at a few units per year, scaling short term probably will not present any major management problems.
There are fires that the owner or manager has to put out on a routine basis. The hiccups that come along with a short-term rental are usually different. There are a lot of communication-related tasks which require work.
If you are looking to build a business in real estate that can offer more options for growth than only from acquiring more units, then STR may be for you.