Silcone- I like both Tantus, Fun Factory and Vixen. Tantus toys tend to be slightly stiffer that the other ones, and really only Tantus has perfected the shiny smooth surface for toys which can cut down on drag. Vixen is nice if you want a softer silicone. I saw theirs once described as "pillowy" and that is a great description - you can feel it squish a little when you squeeze it with your anus.
Fun Factory seems a bit softer than Tantus, and they have some good designs.
For silicone dildos, I like Tantus and Vixen. Tantus for regular silicone, Vixen for realistic Vixskin.
For anal toys, I'm not so fond of silicone. I prefer glass or metal, since they don't retain smells.
My favorite glass manufacturer is Xhale, hands down. The glass is perfect and beautiful, though pricey. For lower cost glass, our new pieces from SSA are affordable and very, very pretty.