The IGT S2000 platform had a few different models but used the same cabinet...it is a reel-based machine.
The IGT Vision series used the same cabinets but added a small computer in the topbox with a small LCD screen....so essentially, it's somewhat of a hybrid.
That LCD up there in the topbox display is THE main clue that it's a Vision machine.
The IGT i-Game came out immediately afterwards, used an entirely different door and is a video-based machine with a different MPU board and far better video graphics than the Vision platform - this was the turning point where the reel-based games were on their way out.
All of these platforms had a version of a "Sit-Down" model to go along with the basic "Upright" machines.
They all had a "Bar-Top" counter version as well.
I am not sure if the S2000 or Vision series had a "Jumbo-sized" version...I've never seen one.
I know the S+ platform made one in the 80's and 90's....these were huge and weighed about 800lbs!
To further complicate things, some of these platforms had a "Cruise-Ship" style version in which the machines had narrowly-sized cabinets.