Spinner luggage refers specifically to the presence of 4 wheels on the case, allowing you to roll the bag in an upright position alongside you, instead of pulling the bag behind you. Standard rolling luggage has 2 wheels, usually in line skate wheels that offer a smooth glide, but can be more of a strain on the back and neck because you must pull this luggage along behind you. Spinner luggage stays upright next to you, with wheels that swivel as you change direction. Many people find spinner luggage to be easier to handle, with significantly less stress on the body.
Suiter style luggage is something else entirely. ‘Suiter’ refers to a compartment that is sometimes built into the case and sometimes removable, that allows you to hang garments to minimize wrinkling. This works well for suits, dresses, shirts and blouses because you lay the garments flat in the suiter compartment, and then fold it in half or in thirds, into the suitcase. This really does help reduce the wrinkling that occurs when you just fold garments and pack them in the case.
Spinner luggage can have a suiter compartment, and suiter bags can also be spinners. Briggs & Riley is a perfect example; they make luggage with the suiter feature as well as with spinner wheels.