I prefer and use a seed singer.

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Is it open source 100%?

Yup. I think they even have reproducible builds now.

Thanks for your help

Bit again "best" is Subjective. If you don't want a signing device and prefer a device that stores your seed on the device then a CC or a jade or whatever might be a good choice.

A seed signer is not a hardware wallet in the traditional sense of hardware wallet.