All of them, when well made can be extremely luxurious. Stainless steel is so shiny and pretty and well made stainless that won't rust or tarnish is so nice and has such a nice heft to it. Some glass is kind of boring, plain clear and not very exciting, though still awesome in feeling. But some of the dichroic or really fancy glass designs are so beautiful and artistic so very luxurious. The velvety, premium silicone always feels super luxurious to me. Of course, they can all be done badly, cheaply. Silicone with seams or tons of drag to it, glass that bubbles and chips easily, steel that tarnishes or has seams. :-( Wood, to me, seems like it might even have all of these beat. Certainly in price the only thing comparable is very weighty, high quality steel. Wood is lightweight (both a pro and a con for some), safe, beautiful, "green", and some of them don't even look like sex toys! Of course, then there's gold or silver toys priced in the thousands. Super luxurious.