ETH may bring higher returns over the next 10 years but bitcoin is far safer as an investment due to a much lower supply & its decentralised nature. ETH has much more points of failure, it’s a far riskier investment. It all depends what your level of risk is & what you’re looking for.
Bitcoin is more decentralized than Ethereum, because Ethereum still depends on the development of the project and also Vitalic.
If Vitalic is no longer CEO and their CEO is replaced with a new one, of course the future can also change, whether it's good or not,
from this we know that Bitcoin is still much better in the future.
It's not just that Bitcoin lags behind Ethereum in terms of decentralization. But to compare Ethereum with Bitcoin I would say it's t is foolish. Since it is an alternative coin, it will always rank after Bitcoin. But I wouldn't say Ethereum is bad as a long term project or coin for those looking to invest in alternative coins. Moreover, if you want security profit etc. together, I would say to choose Bitcoin.