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I've found I get the best shifting performance with Amsoil Manual Syncromesh Manual Transmission fluid. I've tried MTL, D4, Royal Purple MT fluid, and find Amsoil to be the smoothest shifting in cold or warm temps. Most of my experience was with an E36 M3. I just changed the tranny fluid on my new to me 135i 6MT M Sport with Amsoil and immediately noted smoother shifting. Amsoil is a low viscosity (5W-30) oil, so I can't comment on autobaun applicability.
For the diff I've had no issues using Mobil1. Given this is an open diff, I'm going to change it out later since my mechanic has told me the BMW fluid is fine for longer intervals in an open diff.
Rich
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