Hardware Wallets - Ledger vs Trezor, Other recommendations?

[Pmalek]

...neither can we add features.

Ledger has a developers portal where you can build your own apps, add support for them, create your own tokens, and connect them with Ledger. You probably can't add features or omit something from the coin apps that are already supported, but if you know what you are doing, you could build your own.