Hey there! Thanks for your question. I think a few factors come into play when settling on what tile format would be the best choice for you. First is scale - if the room is very large then a small format tile may appear busy with a lot of grout lines drawing attention. The next is the style you're going for in the space? If it has a touch of nostalgia to it, then perhaps a traditional 3x6 subway is a great choice. If you're trying for a more modern or transitional feel, a larger format comes across as a refreshing take on an old classic. Best of luck!