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Gearbox (belt transmission) improves resolution because it is pretty linear and also increases moment (torque), while microstepping is not linear and positional accuracy depends on load (it is best with no load).
So, steppers driving worm gear directly will work (EQ8) but steppers must have high torque and be of better linearity - therefore more expensive.
However, linearity is not such an issue if guiding is used... which is almost a norm anyway.
For worm gear reduction, 130:1 means 130 turns of worm for one rotation of worm gear.
It also (usually( means worm gear has 130 teeth (if this ratio is not known, you can always count teeth or rotations.. it will always be a whole number)
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