Both Ledger and TREZOR wallets have proved to be a safe and easy-to-use solution for storing your Bitcoins. When Ledger started out, they didn't seem to have a good enough product as TREZOR did. However, today the line between the companies has pretty much evaporated and they are equally good, in my opinion. However, to be on the safe side I generally use more than one hardware wallet and I try to make sure to use models from both companies. One thing to keep in mind is that unlike Ledger, TREZOR's technology is completely open-source, which is considered more secure.