What is the best platform to buy Tether gold (XAUt) in the US?

I want to start migrating my gold ETFs to tokenized gold in the form of xaut, but not sure what the best platform is. Has anyone here got any recommendations? I want the best rate possible but also trustworthiness and security is super important. I don't have a ton of experience with 'crypto' so need it to be as simple as possible.

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