Case uses either stainless steel or chrome vanadium. The product description will usually say which steel it is. CV is a tool steel and is not stainless. Some prefer CV, others like stainless steel. I prefer their stainless, it's not high end steel , but it works for most applications.
The handle materials they use are both organic and synthetic, the product description will list handle material.
I'm not a fan of their stag, but they make a bone stag ( cow bone carved to look like stage) which looks great.
I do have a slimline trapper in brown delrin, it's a pretty good knife for the price. It's a perfect size and weight to carry in dress pants.
IMO , GEC is a more premium knife, they're constructed the way a knife was produced years ago, lots of hand finishing on those. This is only my perception, others might disagree.
Most GECS are not stainless, they have some... most of the knives with the acorn shield are stainless.
If you like stag, their stag handles are the best (IMO)