What project will the tile be used for?
Shower floor tile is recommended to stay under 2" x 2" per tile. This allows the homeowner to gain traction when the flooring is wet to prevent falls. Examples of this size includes penny round tile and hexagon mosaic tile.
Tile choice for flooring must consider traction for safety reasons. Ultimately, this decision is up to the homeowner, but please consider that any tile that is labeled "polished" will be extremely slippery when wet and can pose a fall risk, especially as a bathroom or kitchen floor where wet floors can be a common occurrence.
How much maintenance will be required?
Natural stone tile, such as marble, will require the most care and maintenance after installation. Sealing will be done after installation to protect your tile, but this must be repeated again in the future to protect and maintain the tile. Cleaning products must also be chosen carefully to avoid damaging natural stone.
Porcelain is the strongest tile and is a common choice because of its strength and because it does not require upkeep like natural stone.
Ceramic tile, similar to porcelain does not require upkeep but is not quite as strong as porcelain. For most projects, once the tile is installed, this will not be a cause for concern.