Once the seed phrase is generated I'll backup and import it into an air-gapped hardware wallet. But I personally prefer to use a popular open-source wallet for creating the seed running on my Desktop PC (my hardware). I'd use Electrum or Bitcoin-Qt but I understand they cannot create BIP39 seeds.
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My question is: why don't you generate the seed phrase on your hardware wallet? If you trust using it, then you should trust it for generating you the seed phrase.
Also, another question: what's your hardware wallet? The majority are not airgapped.
Good question. I will like to know about this. From how he posted it, I thought he was referring to his computer.
I would advocate hardware wallet as a SEED source. At least with such opt you could be able to use the multisig set up grounded on Sparrow and your air-gapped HW.
Here you can find the instance relevant to Passport-Sparrow-multisig wallet.
Even offline computers (being infected ) may create compromised SEED.
Airgapped devices are also good if you know what you are doing. You can also use airgapped device for seed generation. As long as you format the device and reinstall its OS with the Bluetooth and WiFi card removed, you have nothing to be worried about. Some people can even go for Tails operating system which comes with Electrum, or using formated drive or card to save the wallet file and install it on the airgapped device.