Tuning A6 3.0 TDi Quattro Tip

NalA6

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What is the best company to use for remapping an A6 3.0 TDi Quattro Tiptronic?
I have been looking at the following:
MTM: 285 BHP and 525 Nm but quite expensive
AMD: more or less the same
Superchips: 260+ BHP and 520+ Nm but very reasonably priced

Are superchips OK or should I spend the money with MTM ?

all suggestions welcome