Either bitcoin core or electrum for me. Since installing electrum is usually faster, electrum mostly wins against bitcoin core. Your address is only as strong as your weakest link in your home pc setup. If you have a compromised OS, it don't really matter which software you use because you will get hacked anyway.

Linux, Electrum does it for me. I don't about the internet connection because I am behind a firewall and I don't install unpopular crap to my system.