Both Litecoin and Dash have been around for a long time now and have a good history of flare ups if you look in the previous year charts. I think when the time comes, and it will come, both these coins will make huge surges in prices. If it were me, i would split my money into both these coins.
If you only have one choice invest into Litecoin or Dash, what is coin you will choose? Because I know invest into both is final choice when you cannot confirm one of them better or worse than.
According to my research, I would say go for Dash atm until there are chances to make some great fortunes mining it because Litecoin mining can be considered same as Bitcoins, too much difficulty and less outcome whereas Dash's calculator shows that some fortifying returns are possible through its mining. Those who took the advantage of buying D3 must be minting some hard cash through it by either mining or selling it for more than 3x prices (I know a genuine person who does). If you are a noob and you don't want to wait that hard for your ROI, then Dash is the best choice atm.