That's for sure the altcoin that has to be in portfolio. For the long term it will be the best because all the path it shows gain and it still the coin for top5 - top10. If you are investor and you don't care about time - Litecoin is very good option!
Many questions like this actually but no one knows when is the good market. Litecoin are also good long term so you can expect up and down on the price.