There are a few things to consider when deciding which Cricut blade to use. The first is the material you'll be cutting. If you're cutting paper, cardstock, or thin vinyl, you'll want to use a Fine Point blade. For medium-weight materials like leather, felt, and balsa wood, use a Deep Point blade. And for thick materials like chipboard and aluminum foil, use the StrongGrip blade.
Another thing to keep in mind is the size of your project. If you're working on a large project, you may want to use a longer blade so that you can make longer cuts without having to stop and change blades. Conversely, if you're working on a small project or need to make intricate cuts, a shorter blade might be better suited for the task.
Finally, think about how often you'll be using your Cricut machine. If you plan on using it frequently, investing in a higher quality blade will pay off in the long run since it will last longer and make cleaner cuts than a cheaper blade. However, if you only plan on using your Cricut occasionally, there's no need to spend extra money on an expensive blade - any of the standard blades will work fine.