Litecoin was one of the first altcoins to appear so it was heavily inspired by the ideas behind Bitcoin. In fact, it is made to be the currency that will address the major drawbacks of Bitcoin. It is 4x faster (2.5 vs 10 minutes for releasing a block) and mining is somewhat easier.
It certainly has been over the years, even though there were short term fluctuations that are inevitable for any currency. But at the end of the day, it has always been in the top 5 cryptocurrencies.
It is traded on almost all reputable exchanges, so its very easy to get a hold of it. However with the current price at $151 only did you think it has a high probability of increasing in price drastically possibly competing with bitcoin in the future as a means of storing value??
That will depend on how much money do you have. But if I were you, I am going to buy litecoin because it is a top coin and it is much cheaper than bitcoin. Even though bitcoin is the best crypto coin right now, you shouldn't doubt litecoin because it can also become bitcoin in the next 5 years.