I will go for ETH any day if you ask me as I'm comfortable with it and never tried LTC. ETH is fast enough for me and with low transaction fee. It's next to bitcoin so I think it's good enough.
Everyone believes in the quality of the Etherum coin. Etherum has a high level of confidence and we all know that Etherum is the best Altcoin available today. maybe some people will try another coin, but for some people Bitcoin and etherum are the best choice, they will not try another coin and will try to focus on some coins only.
in long term that is right. Bitcoin is very famous and attracts money -> price grow. ETH smart contract is the superpower. It makes Ethereum ecosystem grow constantly -> price grow.