I know this has been probably asked a million times but I decided to go all in (investment money speaking) on bitcoin so I am looking for a safe wallet.
I have some stored in blockchain digital wallet but want to take it offline just in case. I did use electrum in the past and still considering it.
You already had the offline wallet that I'm about to suggest, electrum is what almost everyone prefer here. And I have some funds there probably 1 bitcoin and I don't have any plans on using them that's why you are good to go with electrum and there's no need to worry about it because it's one of the safest offline/desktop wallet ever.
I am also using electrum and I have no issue using it. I used to save my bitcoin in Multibit but the moment they upgraded to HD, they remove our rights to save private keys (probably there is still option to but I cannot find it) I think these wallets are safe as long as your system is not compromised. Others also use paperwallets.