Hi, I will try to answer to some of your questions.
First of all, the adoption depends on your needs: some people are ok with paper wallets, others prefer more "solid" solutions such as Trezor or Ledger.
The advantage of the latters, is that you have an additional password to protect access to your data, and you can backup your wallet by using the mnemonic phrase. I am not aware whether you could use the mnemonic phrase to backup from one brand to another.
Maybe some more skilled users can answer to your more technical questions.
I think you could also be interested in this article, which is about security and different wallets
https://medium.com/santiment/the-crypto-traders-guide-to-online-security-8eeffa6839edLet us know what type of wallet you decided to use!