Honestly i think those altcoin almost all the same copy paste only the name are different if you want to invest safety that you will not lose fast.. but you can earn a profit.. try to check the coinmarket cap choose top 20 select what altcoin you want and i know they are safety to invest with security if what security do you mean. you can put any password to your wallet so that no one can get your funds.
There are several that focus on security aspects. I'll tell you about bitbay because that's the one I'm most familiar with. Bitbay has:
-Multisig. You can use two keys from one computer, or you can spread the keys on two different computers. Separate password for each key of course.
-Steganography . Hide your keys in pictures.
-Next update will also have a defence against keyloggers
There's a lot of other features as well like market, smart contracts and double deposit escrow, but I believe the above ones is what you are asking for.