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It's a 2002 1.8T Quattro manual A4 that I'm married to (had it for ever, it's low miles, modified, well maintained and quite fun). Another member here (Luxter) made up this useful chart of transmission oils:
The 2 shaded rows are the 997 stock oils. I couldn't find Shell in 1 litre bottles except shipped from Europe.
I'm not sure what the stock fluid on the A4 is (could be Fuchs).
I'm surprised you don't like the Motul. As per the chart, it should work well when the transmission is cold. Fuchs looks inferior to both Motul and Shell as per the chart. I definitely like Shell better than the stock fluid, when cold or after it warms up.
I'm using all the same fluids on both the 997 and the A4 these days (Mobil1 0W-40, that Shell transmission oil, G12, ATE Type 200 brake fluid, ...). No problems with either car.