Tile cutting boards are the standard pieces of equipment to cut man-made tiles, such as ceramic and porcelain. They utilize a diamond or carbide tipped blade that scores the surface of the tile, then pressure is applied via a handle to snap the piece of tile in two along the scored point. Tile cutters can only be used to make straight cuts, such as where a piece of bullnose tile terminates against an inside wall.
Tile wet saws come in a variety of sizes, from small versions that utilize a 4-inch blade to the standard size which has an 8-inch blade. Larger, commercial versions are also sold which have a 14-inch blade. Through a combination of water and a diamond-tipped cutting blade, they can cut any man-made or natural stone tile, regardless if they are field tiles or bullnose tiles.
Angle grinders can be useful for small-scale projects where you don't need to make a lot of cuts, such as with a countertop where you only have a couple of pieces of bullnose to cut in. However, an angle grinder is not a finishing tool, which means any cuts made using a diamond or carbide blade are rough, and are only for areas where the cut will be covered by another material.
Handheld tile saws are similar to circular saws except that they can be used either dry or wet. You can use a handheld tile saw for trimming down a piece of bullnose, for example, or cutting it to fit against other field tile. They use either diamond or carbide blades, and are sold in either 4- or 8-inch formats.