Just use the ledger one, trezor is safe but it can be easily broken because it is more flexible.
The ledger one is like a pendrive in aluminium, it is almost impossible to break and it can resist for a few years.
What wallets can I use to store bitcoin on ledger Nano except the ledger app one?
What a horrible idea, myetherwallet is one of the most un-safe wallets that are online, it can be easily pished by hackers. Just store your Erc20 tokens in the ledger, they allow them.
Like ethereum can be stored using myetherwallet.