Pretty simple. The cheap inexpensive ones from say Harbor Freight will get the job done but have limitations, adjustability, what surfaces they can roll on, effort to move, etc while the best on the market like GoJaks are, although very expensive, are miles ahead of the HF ones. With the HF type you have to jack the car up and set them on the dollies whereas the GoJaks you simply place them around the tires and raise the car up onto the jacks with a simple operation of the pedal so no need to bring a floor jack or other means of raising the car with you. I can move a car around in my shop with ease by myself with the GoJaks whereas the HF ones take at least two people and do not always move in the direction you are trying to push them in. Simply put, if you intend to use them a lot, buy the GoJaks. If only temporary and usually in a straight line then use the HF ones.
I actually have both in my shop and use the HF ones if I simply want to move a car back and forth in a relatively straight line and store the car on them. I use the GoJak when I want to spin a car say 180* or move it sideways or even out into the parking lot.
For this example I have used the cheapest and the most expensive.
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