FWIW, all Siemens appliances are manufactured by Bosch Siemens Haushaltsgeräte (now BSH Hausgeräte)[1]. Siemens sold all of their shares to Bosch in 2014.
Miele is available, though not at more commodity stores like Best Buy. We replaced our awful 3-year-old waste of a dishwasher for a Miele and have been happy. In terms of cost, the original (Electrolux?) was like $800 and the Miele was maybe $1100. But the Miele has less capacity and is louder. Which I'm OK with in exchange for reliability and sound construction, but if we hadn't gotten such a lemon before I might have had a harder time justifying it to myself. When my fridge finally dies, I'm sure before its 10th birthday, I'll probably replace it with a Miele.
Miele has a rock solid reputation in Germany when it comes to washing machines. As the old folks say "Miele, Miele, sprach die Tante, die alle Waschmaschinen kannte", which means something like "Miele, Miele, said the aunt, who knew all washing machines".
Not sure about other appliances from Miele. My Miele dryer lasted only 10 years (with a broken drum, beyond repair), which is far less than what you would expect from Miele.
Miele is here, but they're known for vacuums and dishwashers, mainly. The Miele laundry appliances have tiny capacities compared to everything else sold in the US. My assumption is that Europeans wash clothes more frequently, in smaller batches.
Years ago, I bought a Miele dishwasher with cutlery rack; it was incredibly good. Other people have had mixed experiences. Service is difficult to find for Miele.
Miele machines are expensive but indestructible. Siemens ones are very strong and not much dearer than other brands.
Are those not available in the US?