Whenever I see tile counter tops I most always think that it was a DIY job and was tiled because they were being thrifty. Tiles have grout lines, grout is porous and can be hard to keep clean. Most will use dark grout to hide the dirt and stains but it's still a place for dirt and germs.
I have a friend that has done a couple of jobs using granite tile with rectified edges, virtually no grout line, and used silicone to seal the tiny gap.
While he does his jobs pretty much to perfection, I still wouldn't want it in my kitchen.