I'll have to check out the star/square screws, I just got normal Phillips head deck screws, and I definitely stripped one or two. Some of the wood was also nearly impossible to pre-drill through, I've never had that problem before! Fresh battery in the drill and everything, but we powered through.
I see that everyone recommends an impact driver in the coop section - I've never used one, it seems like it would be more for nails than screws?
An impact driver doesn't do nails. It's a heavy-duty tool for driving screws into harder-to-penetrate materials. Our DeWalt 20v makes nothing out of setting self-tapping metal screws into metal roofing.