For VW, Audi, Skoda and Seat vehicles VCDS by Ross-Tech beats everything hands down. it's even better than the VAG 5052 factory scantool. And the price is very reasonable. It also has an OBD2 function, but it will only work on non-VAG vehicles that use a protocol used by VAG, so it'll work on some makes but not others.
I don't think there's a scantool anywhere that genuinely covers everything.
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