Granite and Corian
When I worked on this house prior to moving in (it had been vacant for twenty years), I went through the various choices for a small kitchen counter top and a vanity area in the bathroom. At first, I was opposed to granite, as I was so tired of seeing it everywhere - on TV, in homes, and so on. I then thought about Corian, and in talking with various friends who had the material in their kitchens, every single one of them complained about the scratching (and one woman is fastidious in her upkeep of the kitchen).
Living in a small town, I only had one outlet for counter tops, a local builder's supply store that carries granite, Corian, and Formica. I didn't feel pressured, but the gentleman who assisted me refuses to sell Corian for kitchens. Living in a century-old house, I didn't want the brighter, heavily grained granite, but the guy showed me a Hawaiian green granite that from a distance looks black. Only when the under-cabinet lights are on, does one see a hint of a dark green color.
I chose the granite (I only have one counter - 70 inches in length) for the kitchen, and Corian for the bathroom.
Five years later, I am pleased with both decisions. The granite shows no sign of wear, I clean it with the dishrag when doing the dishes (greasy spills sometimes get a dose of Fantastik), and always make sure that any water or liquid is dried immediately. Pots come off the stove right onto the counter top, the pizza in its pan does likewise. I have never used any special cleaners or sealants.
The Corian has held up well in the bathroom, though the finish has dulled, just from daily use, and if one really looks, there are many little and fine scratches from simple things like toiletry bottles and guests sliding their toiletry kits on the counter when visiting.
So, this long-winded story made short - being mindful of simple care, I am totally happy with both surfaces.
Joe