Using a rectified tile allows you to place the tiles much closer together using tighter joint spacing. This makes the grout less visible as there is actually less grout used in between. When a wide space is used between tiles, the grout becomes a distinct part of the design and if the grout does not blend well with the tiles it can create a less than desirable finish. In addition, the grout can easily become soiled and discolored over time and will detract from the look of the tile itself.
Rectified tiles are generally slightly more expensive since there is additional cost involved in cutting down to size. Additionally, the cost to lay rectified tiles is usually also higher than unrectified tiles since it requires more time, care and flatter substrate.
