I’m considering buying Ledger, but I’m worried about the recover function. Should I get a Trezor instead?

I want to get a cold wallet soon and I'm not sure whether should I choose Ledger Nano S Plus or Trezor Safe 3.

I'm leaning towards Ledger, because Trezor for some reason doesnt support KAS and Ledgers secure chip seems to be better, but I'm kinda worried about the Recover function.

As far as I know I would need to confirm extracting my seed phrase from the wallet, but can I really be sure theres no backdoor?

Which one of them has better desktop app? Can I disable "non cold wallet" features like buy, swap etc. in either of them?