DeepOnion has just been released on the exchange and is set to do exceptionally well. Trezar is also one to look out for. Neo is a definite and I'd say NXS to but it'll need a while to recover. (Then again, which alt doesn't at the moment!?)
As the rest of the guys have said though it's about really understanding the coin your investing in and also analysing the market. There's never 100% certainty though.
There is no reason to deny this fact it is not only certain coin but almost all the coins which are there in the world of crypto currency which are uncertain and volatile in nature. You never know whether you are trusting some right coin or not.
You can only chose some coin based on your own knowledge and skillset. Analyze the things well before concluding any kind of decision.