Good to know electrum will support 24 seed words and pass phrase via bip 39 option for Trezor.
May I ask what the end-goal is?
Let's say you create your seed with Trezor, what are you planning to do next? Are you planning on importing your seed into Electrum? If your Trezor stops working one day, will you buy another hardware wallet or import your seed into Electrum?
I keep my Bitcoin air gapped as I think it's safer than on Trezor that requires regular firmware updates.. The Trezor wallet is only for smaller amounts as quicker to sign a transaction. Yes I will buy another Trezor should it fail, but I like knowing the seed words and pass phrase also work on an air gapped Electrum wallet.