Your coins won't automatically become prone to hack by using Electrum or Trezor, especially Trezor, you have to keep it in mind. The most important part is, how are you going to safely save your seed phrases. You should keep it very safely, so safely that someone other than you, shouldn't have access to it.
Be sure that your PC is clean from viruses, trojans, trackers, etc. Be sure that your device doesn't contain any wireless hardware and is completely offline. Then write down your seed phrases on paper or on steel cassette.
If you want to buy a hardware wallet, then I recommend you Passport wallet over Trezor.