Let's say 1/3 in Trezor, 1/3 in Ledger, 1/3 in BitBox02? I'm currently trying to transfer my bitcoin from an exchange to a cold wallet for the first time, but I'm wondering if it's safe to keep everything in one wallet from one company.
If you can afford 3 hardware wallets, I think that such a strategy is not bad in the sense that you reduce the risk that would arise from the possibility that one of the manufacturers will at some point be exposed to a critical vulnerability because of which you could potentially lose your BTC. Or you can simply create a cold wallet and not trust any company.