The higher end option for how to finish tiling on corners is to mitre the tiles. This looks by far the best but is more expensive (due to the extra time involved for the tiler to make cuts of the tiles) plus not all tiles can be mitred.
Can you chamfer tiles?
Tiles can have a moulded rounded edge, straight cut or bevelled edge depending upon the type of tile and manufacturer. Ceramic tiles are usually moulded while natural stone tiles and porcelain are either finished with a sawn and ground edge or the upper, exposed edge is cut off at a 45 degree angle to form a chamfer.