I have been doing my research on which good altcoin to hold, but i also need your opinion on which to hold.
I do not know if people are so serious whenever they ask questions like this. Asking for the altcoin to hold, is like asking someone to tell you what he knows. What about if what he knows is not a good choice, would you hold him responsible for that mistake.
Which is why you need to do your own due diligence in researching on coins yourself.
Invest in only what you are confident of and that you personally trust.