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That's a nice cage! 
It depends on the Cockatiel. My Cockatiels like both, so they get both, but a lot of people just offer cuttlefish bone. You can put both in and see which one it likes best and then take the other one out - both are good for them though.
Don't give anything to your Cockatiel that has Copper. Why? Copper is potentially toxic to birds although avian toxicity from this metal is less common.
Other then that, I don't see anything wrong with the cage or the accessories apart from the Copper Bell. You also have been doing your research, different sorts of perches you mentioned in the video - kudos!
It depends on the Cockatiel. My Cockatiels like both, so they get both, but a lot of people just offer cuttlefish bone. You can put both in and see which one it likes best and then take the other one out - both are good for them though.
Don't give anything to your Cockatiel that has Copper. Why? Copper is potentially toxic to birds although avian toxicity from this metal is less common.
Other then that, I don't see anything wrong with the cage or the accessories apart from the Copper Bell. You also have been doing your research, different sorts of perches you mentioned in the video - kudos!