I wouldn't even consider a Bitbox. Look how tiny that screen is. The smaller the screen, the easier it is for you to make a mistake.
Bitbox02 is easier to use than trezor safe 3.
For your needs, I would recommend a Trezor. Their hardware wallets are fully open source and probably have the most eyes on the code, which means it's safe.
Yes, I think so, too.
The use of secure element chips is mostly just marketing, because people who don't understand this stuff see that term and think it's what they want, because it uses the word secure.
Can secure element chips be used to prevent supply chain attacks? The Trezor suite app provides authenticity verification for safe 3, but no such function for trezor one.