A premixed grout is the best grout for tile if you are looking for color consistency and a quicker installation. Premixed grout saves time because you can open a bucket and start grouting immediately. Additionally, every bucket is the exact same color, which allows for complete color consistency throughout your entire project. The downside to a premixed grout is the additional cost which comes from the convenience of not mixing the grout yourself and not needing to adhere a sealant afterward. The shelf life of a premixed grout, once opened, is up to two years – if the grout bucket is sealed properly after each application.
A powder grout is the best choice if you are looking for a more cost-efficient product that still maintains quality. Powder grout comes in bags which, if stored properly, can be saved for future use. Additionally, it is less expensive than a premixed grout, which is beneficial if you are working with a large amount of tile. A powder grout cures due to a chemical reaction when water is mixed with the powder, which causes it to harden, much like a concrete. There are a couple downsides to powder grout. The first is the grout is porous therefore it is prone to stains if it not sealed after installation and every few years after. Also, since the grout is mixed for each section, there may be slight variations in the color of the grout.