I dont think Trezor is secure, it's convenient, and it gives "high" security but not "very high" security, but i would not store more than 10 btc with it.

Its the equivalent of a debit card, you dont want your card have access to 1 million $.

For sums bigger than 10 btc, you definitely want cold storage only. I`m not sure if electrum is safe enough yet, since these bugs make me have less trust in it.

Especially the one where your broadcast window opens again after you sent the transaction already. Who knows if the private key is not leaking, since normally the private key would only be decrypted until it's signed, and then quickly ereased from RAM.

But with this bug i`m not sure if the private key is not leaking for more time than that.

THIS MIGHT BE A FATAL FLAW, SO DEVS PLEASE CHECK THE BROADCAST BUG ASAP!