Best counter

Hi there,

I'm doing a beautiful high end kosher kitchen in Toronto, Canada. I will
have two dishwashers, two sinks, two counter areas etc - all to separate
milk and meat food preparation.

What is the hardest, most durable, most longlasting, easiest to care for
material for counters?

I have heard there are differences between polished and regular granite, and
between sealed and unsealed counters. What is your advice/

Is soapstone durable and nonporous enough to warrant a serious look?

Thanks!

Ronitte