I too would recommend people to invest in Litecoins, as we all have witnessed an impressive rally in Litecoins since the start of the year. The team behind Litecoins is already working on it to make it more fungible, which means itll only improve going ahead. Another reason I would cite for investing in Litecoins is the growing adoption rate, which I feel is increasing steadily hence I would recommend it over Ethereum.
Invest in Litecoin is good, but I would prefer to invest in Ethereum. It is personal choice, so let's keep it easy. Litecoin, is a good choice because it will have block halving this year, but Ethereum might have Proof-of-Stake soon (not have exact PoS activation day yet). Another plus point that give me more favorite in ETH is its price chart.