There are two main types of mandolins - the A-style and the F-style. Both have their own unique sound, and it really comes down to personal preference as to which one you prefer. That said, there are some key differences between the two that you should be aware of. The A-style mandolin is typically smaller and more compact than the F-style. It has a rounder, mellower sound that is well suited for bluegrass and folk music. The F-style mandolin, on the other hand, is larger and has a more distinct, bright sound. It's often used in Celtic and classical music.