The difference between a power bank and a power station is size and portability. Every bank and station on this list is portable, to a degree, but it depends on its intended use.
Power banks can easily slip into jacket pockets, into a carry bag or be left in the glove box of a vehicle for quick charging when needed. But power stations are much larger, heavier and are better suited to skywatching gatherings where users are staying put for a length of time.