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How do ball machines throw balls?

All quality tennis ball machines presently available on the market use wheels to throw the ball. Normally there are two wheels that turn in opposite direction (thus the label "counter rotating wheels") and have a small space between them. The ball rolls down a chute and is squeezed by the counter rotating wheels which then eject it. The situation is not all that different from gravel being thrown from under a spinning tire, though in the case of the tire only one wheel is responsible for the "throwing".

What type of stringing machine is the most accurate?

Accuracy is a complicated issue when it comes to stringing.  This is because factors having to do with friction on the string as it passes through grommet holes and with the speed and duration of pull during tensioning have an important effect on final tension.  For example, a string that is pulled to a tension of 70 lb. for a brief period of time before being clamped will have a tension of a bit less than 50 lb. twelve hours later.  By contrast, a string that is pulled to a tension of 55 lb. for sixty seconds before being clamped will have a tension of a bit more than 50 lb. twelve hours later.   This, of course, does not mean that tension accuracy is not important  in stringing.  It must be realized, however, that accuracy has more to do with consistency over the various pulls necessary to string a racquet, and from one stringing job to another, than it does with the actual tension in a string at the end of the stringing job.

What are the main attributes that distinguish different kinds of strings?

The material used in a string (for example "nylon" in the case of synthetic gut), the construction of the string (a solid core surrounded by a single wrap of thinner filaments in the case of synthetic gut), and the gauge, or thickness, of the string define the essential characteristics of a string.