If you think all fasteners are the same, you're wrong. Just ask Jay Markanich.
For instance, staples work great for things like carpet pad. But not for fascia! If you see a board with these sticking out of it, your house ain't built right!
Staples just aren't made to hold up pieces of wood thicker than .05 to .10 millimeters (you know, paper). They do a really good job on that.
But if these are in your fascia, don't be surprised if your house looks like this after a strong wind or a strong rain coupled with a clogged gutter! One this one, the vinyl soffit, gutter, and fascia (still intact with aluminum wrap on it) all came off in 1 piece! It was just sitting on the roof, all together.
So please, instead of staples, use nails or even the proper screws! I know they are harder to put in than staples, but they are the right thing to put in! You'll thank me you did.