All are excellent choices in this price range, but we can narrow it down. All of them pack large batteries and have good range, so that is the least of your worries.
The Porsche Macan EV is high on image value, but as a primarily chauffeur-driven car, it's not great, with ride comfort and back seat space not as good as the rest. The Audi Q8 e-tron has arguably the best back seat and ride comfort of the lot, but it is dated now and is the lowest on flash value, and looks understated like a regular Audi SUV, and isn't packing the latest tech. The BMW iX xDrive 50 EV is an excellent all-rounder that's powerful and great to drive, but while quirky and interesting, it doesn't quite have the presence to make a strong statement. The Mercedes-Benz EQS SUV 450, then, should be your pick. It offers good space and comfort in the second row, excellent range, great image and presence, and loads of tech, including Mercedes' much vaunted 'hyperscreen' dashboard. Resale value is still a question mark with EVs, but Mercedes is trying to change that perception with buyback schemes on its electric cars, so be sure to check those out. 
