To choose the best grout saw, think about whether you want to use a power tool or a handheld tool, what kind of blade you need, and if there are any extra features that would be helpful to you. A grout saw can be its own handheld tool or be an attachment that works with a powered tool. There are advantages and disadvantages to each one. The blade of a grout saw can come in varying shapes, sizes, and materials, so think about which best for you. Additional features and options may affect how comfortable you are using your saw.
Deciding between a powered saw and a handheld one is probably the biggest choice you will make. A powered saw can make grout removal quicker and easier, but it also increases the risk of breaking tiles. It also creates more dust and mess and will cost you significantly more. A handheld tool requires more physical effort, but it is easier to control and much easier to replace because it is rather inexpensive. Think about how much grout you need to remove and whether you plan on using the tool again.
The blade is the part that actually does the cutting, so find one that works for your project. Blades are made of different materials, including carbide, tungsten, and diamond coating. They vary slightly in how sharp or durable they are, and some are specifically made for use with certain types of tile or grout. The shape of the blade also affects how you can use it and might be triangular, circular, or pointed at the tip. Consider what type of tile you are working with and how large the grout lines are.
Extra features that affect the usefulness of your grout saw include specialized handles and built-in replacement parts. The handle will matter more with a handheld saw. Some handles are made out of softer material or have ergonomic shapes, so actually hold the saws to get an idea of which one feels the best to you. If the blade you choose has a carbide tip, keep an eye out for saws that come with replacement tips and even a storage spot in the handle, so that they are always there when you need them.