For in-depth reviews and comparison of the Trezor and Ledger Nano S, please see our hardware wallet review section and the relevant reviews for each wallet:
The Digital Bitbox I’ve never encountered and we haven’t reviewed. I suggest reading up on the Trezor and Nano S and then you’ll have enough info to compare these 2 well-known wallets to the Bitbox.
One thing I’ve noticed is that the Bitbox supports fewer altcoins (only Bitcoin and Ethereum). I also expect the Bitbox does not have splitting tools for forkcoins, which make it easy to claim forkcoins via a Trezor or Nano S.