I think silicone is best for me, as it's super-safe and the squishiness makes it more versatile for my tastes. If I got a textured toy, I'd rather it be silicone than something rigid, like metal or glass. I love my Pure Wand and Pure Plug, though. And Emerald Explorer.
Silicone is my number one favorite, I also like glass, followed by metal and stone. I prefer materials that are clean, sturdy and long lasting. But silicone is the only one of those that has any give, which is nice and provides options that some harder materials can't.
Right now I'm really into glass and plastic separately. I have been buying a lot of silicone toys, and even though they are super safe. The material itself is driving me nuts. It's way to draggy, some of it smells weird, it's peach fuzzy. I just don't like it any more. Glass is clean and can be sterilized, it can be heated or cooled. And plastic is just hard enough so I can get good pressure where I need it