Go with bitcoin over litecoin for sure. Bitcoin has a much larger following and userbase. Currently litecoin is down a much larger percentage from its previous all time high than bitcoin is.
There are a few things that bother me about Litecoin. For one thing the creator of it apparently sold all of his stake in Litecoin which to me is a huge negative.
Secondly, I have owned Litecoin in the past and I have always been disappointed because it always lagged behind other top cryptocurrencies in its growth. It used to be the clear number 2 coin behind Bitcoin, but it keeps getting passed by other projects.