I'd categorize both of those as "endorsed by particular fringe groups" instead of recommended by the community. I don't know why you'd use either of those over Sparrow.

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Well, knots being a forked node implementation I've never heard anyone running it to use the wallet. Is Luke doing something cool with the wallet? And the main draw for wasabi is access to their coinjoin implementation. But you don't need that for a cold wallet. Sparrow is the most featured desktop Bitcoin wallet. It has good interface with different hardware signers and the dev is the extremely focused on practical new functionality.