Depending on the job might go for a dry saw. A wet saw consists of a blade that is coated in very small diamonds. In addition, the basin of water below the blade keeps the temperature low. Installers will use a wet tile saw for hard or dense tiles as it can incrementally speed up the cutting process.
They may also do this for larger jobs where a lot of tiles need to be cut. The water is crucial when cutting through hard tiles like porcelain as it will prevent the blade from overheating or smoking. This overheating/smoking can create a lot of friction, and it is this friction that can prevent the blade from performing its task correctly.
While dry saws are more appropriate for smaller and thinner tiles, for thick or hard, or dense tiles, a wet tile saw is a far better choice. So ultimately, white dry tile saws are appropriate for smaller projects and mosaic tiles.
On the other hand, a good wet tile saw is appropriate for cutting all tiles.