The compelling purpose to make use of completely different manufacturers in a multisig setup is provide chain threat. To illustrate you had a 3-of-5 multisig/threshold setup utilizing manufacturers A, B, C, D and E. A preinstalled vulnerability within the machine or firmware of A wouldn’t trigger you to lose your funds as model A would not have sufficient keys to maneuver your Bitcoin. There would have to be preinstalled vulnerabilities in a number of merchandise throughout completely different firms (and probably jurisdictions) which might be a lot tougher to tug off. If A, B, C, D and E are all the identical product from the identical model a single provide chain assault may trigger you to lose all of your Bitcoin. Michael Flaxman mentioned provide chain threat on the Stephan Livera podcast in August 2019.
Safety is all the time a posh, multifaceted subject. If there have been a dearth of competent, reliable producers of {hardware} wallets/signers then you definitely would possibly nonetheless select to take the chance on a single producer for all 5 units A, B, C, D and E. On this case the diversification profit could also be dwarfed by introducing a number of inferior, much less trusted units to your setup. Additionally the implementation of a multisig setup utilizing a number of completely different units is barely extra complicated and will increase considerably the prospect for errors within the multisig code or within the person actions (backups and so on).
We will not do product evaluations on this website for good purpose however the two producers you point out could be among the many most trusted and competent within the trade. You might also have an interest within the merchandise that Michael Flaxman recommends utilizing within the 10x safety information.