Is there a difference between btcarmory.com and bitcoinarmory.com? Does it metter where I download their software?

I have a bitcoin armary wallet with some bitcoins and coins from the forks (cash and gold). Is it possible to take that private key and import it in a trezor (or any other wallet)?  
In other case is it possible to send it to a trezor T? (I read something about wallets that doesn't support old keys that starts with 1 or 3..)

I was thinking of getting a model T and a model ONE as a backup. Is it only to take the backup seed and restore it in the model ONE? But model ONE doesn't support everything that model T does, will that work?

I was looking at ledger and trezor but I did like trezor a bit more. The key different that made me chose trezor was that it felt more secure, with an open firmwire. The big negative thing that I think is that it's mutch more expensive. Is there any other disadvances that I should think of before buy a it compared with other hardware wallets?

I have one wallet with some bitcoins. If bitcoin continues to grow in value (think 100k - 1000k) that wallet will be very valueable.
1. How do I sell my bitcoins without any noticeing my wallet and who I am? Should I always use a vpn when sending a transaction?
2. Is there criminals that searching in blockexplorer (or in another way) to find a wallet like mine and then searches up those ppls in the real world and threats them to their life?
3. How do I best sell / splits up my wallet
4. Can I trust the exchanges? They have my personal information.