I recommend the first link then. Holds 24 cartridges if you're going physical. It comes with a large stylus, has room for a charger, and holds 2 styluses. Also in person the orange is actually darker so it matches perfectly with my Samus 3ds.More like the first one. Something to carry the console in but doesn't stay on all the time.
I also have this one for my old 3ds.
https://www.amazon.com/dp/B00DWXUYN0/?tag=era0f0-20