The investor's interest in Ethereum is greater than that of Litecoin. Even though Ethereum does not have a supply limit, the smart contracts owned by Ethereum are a very powerful mainstay to increase investor interest. The Ethereum smart contract also has a great opportunity to increase the price of Ether, because the investment in the token goes through the Ethereum smart contract. The issue of the emergence of Ether2 can also change one's mindset towards Ether.
As they always say, "the sky is the limit". While theoretically Ethereum should have a lower price than Litecoin, the demand for ETH on the market is booming. People are quite fond with ETH than they are with LTC. As long as this is the case, ETH's prices will be a lot higher than LTC's. Things will be better for Ethereum if the team decides to adopt a monetary policy (just like Ethereum Classic did some time ago). This will ensure ETH remains scarce, mirroring Bitcoin in every way. Combining scarcity with smart contract functionality should bring the best of both worlds into the ETH ecosystem.
For now, let's focus on the next big upgrade (dubbed ETH 2.0) that will make Ethereum faster, cheaper, and stronger than ever. dApps should be able to benefit the most as fees reduce by a large margin. Whenever ETH's price will go higher after the upgrade or not, will completely depend on the level of demand on the market. At its current state, I'd say that ETH is overpriced. But everything could change as the ETH dev team adjusts the cryptocurrency's economic model. As far as Litecoin is concerned, I think that it's a great alternative to the Bitcoin blockchain. With a limited supply of 84 million coins, LTC's prices should be a lot higher than what they are right now. But the lack of mainstream adoption, explains it all. Since ETH has higher adoption than LTC, one would expect Ethereum to remain on top of Litecoin for a very long time. Just my opinion