The 4x6 is a little bigger in the comparison of size between how big is a photo 4x6 vs 3x5 because it has a more detailed look and it looks wider. A 3x5 is smaller and more compact and is commonly used in older photo albums. The recommended size of 4x6 is what we use at Visuals Clipping as a modern print and you will have more space to put your images. It has been adopted as the new standard.