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I own both. You’re not going wrong with either.
Ledger Live isn’t the end all be all, but I think the most simple secure setup for a hardware wallet is iOS setup + Nano X + metal backup. The reason why is it’s more likely your laptop or desktop is compromised than your iOS device (providing its updated).
IIRC I think Nano X has better on device physical security, but at the same time Trezor is open-source while Ledger is not. So do with that what you will.