Take a look at this analysis of Trezor vs Ledger Nano S (best comparison I have found on internet)
https://blog.gridplus.io/hardware-wallet-vulnerabilities-f20688361b88
Also make sure to take advantage of black friday 21% OFF offer for Ledger Nano S:
https://www.ledgerwallet.com/r/590f?path=/products/ledger-nano-s
