I am a borderline paranoid guy when it comes to financial matters, including BTC. Why not store some BTC in both? I am familiar with Ledger Nano, and I like it (I also like the Trezor). The Ledger Nano also has a way to recover your BTC if the unit gets lost. In general, having your BTC is a couple of different places just seems wise.
Correct. However, doing so increases the inconvenience and the chance of losing a part of your coins (you have to take care of all devices/backups).
Yes there are options to recover your wallets using the 24 words generated when initializing your wallet.
Good to know. I would advise you to test it out once. IMHO, if we are dealing with a larger amount of money then dealing with the little inconvenience of backing up Armory and keeping it offline somewhere is worth it. If it is an average amount of money then I'd go with Ledger Nano and backups.
Thanks for taking the time to answer Lauda !
You're welcome.