Look up the x profiles of the people mentioned. They have different takes. Everyone is different with their stack amount, technical capability etc.

The thing about multivendor is, it shouldn't matter what signer you're using because NONE of them should be generating your keys. But if you are going with stateful signers, and trusting them to keep your keys secret, then perhaps it could add some benefit to use different options. The issue is, the best signers are all the stateless DIY ones. Coldcard was the only stateful one I don't have at least 3-5 issues with that didn't magically go away just because Coldcard had a key generation flaw.