Favorites? Hmmmmm....
Canvas Micartas, dark hardwoods like Cocobolo, Wenge, Rosewood, etc.
Not a huge fan of how G10 feels by itself, I like texture in a handle.
I haven't had a chance to play with Ironwood yet but from what I have seen of other makers work, I would enjoy it.
I like contrast so I'll often laminate some light and dark G10 under the wood eg. 1/4" Cocobolo, .060 White G10, 1/8" Black G10.