In my personal opinion, 3cm (1 ¼ inch) slabs are best for
your kitchens because you put heavy pots and pans on your countertops and you
likely will have an overhang for a breakfast area.
The 2 cm slabs are excellent to make a feature wall because
they are lighter, therefore easier to “hang” onto your wall. They are also good for bathroom vanities, as
you don’t put heavy stuff on the counter in your bathroom.