First, I don't want to choose the Vote that OP inserted in this topic.
Second, I prefer Ethereum coins over Monero coins.
Third, I also choose Monero if forced, it must only be for short-term trading to get profit.
The difference between the two is very clear, Ethereum was created for a more complex system with the way Smartcontracts work and various ERC20 token features, NFTs, etc. While Monero as far as I know is only to be a privacy coin, the rest is nothing more and maybe only secret, fast transactions or coins specifically for payments.
In conclusion, I still choose Ethereum because Ethereum is simpler and easier for me to understand and also many communities like Ethereum than Monero.