BMW M Adaptive Suspension - Any good vs Audi

[Brian_374234561]

Hi all, I've currently got an Audi SQ5 Vorsprung with the variable suspension settings which includes air self-levelling suspension. I'm looking at purchasing a BMW X3 M40D which comes with M Adaptive Suspension. From the desktop research I've done, the BMW suspension is not air / self-levelling, but I've read it's still very good for towing. I tow a big twin axle van, does anyone have any experience of both set-ups and can let me know of pros and cons? I've read the Practical Caravan review of the BMW and it's very good, but I worry about not having self-levelling on the BMW (not that I tow above the nose weight of course!), but it does make it nice and stable. Thanks in advance for any advice