Personally i would chose Litecoin because it is more stable and now it's growing pretty good, as for Ripple it is a good coin but it's pretty unstable, as for me stability is more important than sudden growth and possible big decrease which may bring more looses than profit. But you should know, it's not like you can invest only in single coin, if you want to you can invest both and get some nice profit if you're careful enough with Ripple.