The original hardware wallet, and the only major one that's fully open source - you can literally audit every line of the firmware code. Some people pick Trezor over Ledger specifically because of this transparency. Supports fewer chains than Ledger but all the important ones are there. The Model One is the cheapest serious hardware wallet you can buy. Interface is slightly less polished than Ledger's, but the security model is arguably stronger due to full open source.