I think you are talking about different types of nail guns. At a minimum, one type for the sheathing and fence and another for shingles. You could do the fence and sheathing with a framing nailer. But to do shingles, you will need a roofing nailgun.

For the fencing you could even get away and may even want to use something lighter than a framing nailer. A framing gun is made to drive larger nails into thicker material. Redwood fencing is fairly light wood and typically thinner. You may want to use staples or a finish nails to prevent splitting. This would be a different gun from a framing and a roofing nailgun. Also, because you are using redwood, you will want to use stainless steel or aluminum fastners. Redwood and cedar will stain with other types of nails, including galvanized. the zinc in galvanized nails reacts chemically with cedar and redwood. Nail manufacturers recommend that you go with aluminum or stainless steel fasteners when you're using either of these woods -- and whenever you're using pressure-treated wood. (The preservatives incorporate salts that react with the zinc.)

Thanks for the information, masiman. You've given me some things to think about.