Peercoin
Nubits
Without arguments or anything to convince me with ?

~ Madness
First of all, I agree with the sentiments of most posters here. Do not be swayed by other people's opinion. Also, do a lot of research before investing. Now, let me answer your question.
Peercoin is one of the oldest altcoins out there. It was released on August 2012. This shows that the protocol is secured and stable.
Also, it is one of the most unique altcoins. It uses a hybrid system --- Proof of Work for coin distribution and Proof of Stake for network security. The developer decided to use Proof of Work to fairly distribute the coins. Since Peercoin was not pre-mined or pre-sold.
Furthermore, it is one of the most innovative altcoins. It is the first cryptocoin to use the Proof of Stake concept. Since then, other altcoins have used this concept --- the two most popular ones being Nxt and Paycoin.
To learn more about Peercoin feel free to visit their
website or their
forum. Also, if you are a visual learner, I suggest watching this video ---
LINK. Good luck on finding the right altcoin for you!