What is the most luxurious coach?

I'm curious, what exactly do you consider to be the most luxurious coach in the market today? Is it the one with the most advanced technology and sleekest design, or perhaps the one that boasts the finest materials and handcrafted detailing? Or could it be a combination of both, offering an unparalleled experience for its passengers? I'm eager to learn more about the criteria that define a truly luxurious coach and what sets it apart from the rest.