So ledger is limited to this 3?
And Trezor can connect all of them?
I don't think so. I actualy did not express myself correctly.
I'm not sure if there is support for Trezor in Parity. But both hardware wallets can be used in MyEtherWallet or Geth. And they are not necessarily limited to those wallets.
https://blog.trezor.io/trezor-integration-with-myetherwallet-3e217a652e08I also edited my previous post to answer your question about exporting your private key to Mist.