Do you think Ollivander’s three “supreme cores” are objectively the best wand cores in the world, or just the best ones readily accessible to a British/European wand maker?

Ollivander only uses dragon heartstrings, unicorn hairs, and phoenix feathers. His father, and his ancestors before him, used other materials, like kelpie hair, but the current Ollivander stopped using them because he determined they had issues that made them be inferior quality wand cores.

Veela hair is apparently “temperamental”, but as far as I can tell it works fine for Fleur which may be partially because it came from her own grandmother and might thus response more naturally to her magic due to blood relation.

In other places of the world though, like America, you have magical creatures that are not native to either the UK or Europe more broadly. Such as thunderbirds and wampus cats, whose respective feathers and hair can be used as wand cores.

Do you think thunderbird tail feathers are actually a lower quality wand core to phoenix feathers, or do you think they are equivalent and Ollivander just doesn’t use them because it isn’t cost effective to ship them over from America?