i hold LTC for about a year and  half now and ETH for about 8 months. A i Observe There are a higher gap among the 2. As for Growth in %, In my opinion ETH have the capability to grow fast as it attract many ICO because of it smart contract than LTC. But IMO those coin are worthy and valuable coin in the future, just holding it up and make them a little helping hand when you need one someday and you will realize how good they are.