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. You have to meet certain community standards. The property must be furnished and clean.
If you plan to add capital to your real estate investment pool quickly, then scalability might be essential. 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.