Both have value and market capitalization, both are equally needed by everyone and can also be used as investment assets, but only in different places. ethereum is functional and reliable in the crypto market and gold is reliable in the modern market or the real market. both are the best assets to have.
in fact, be it gold or ethereum, it is clearly very valuable even though it is true that your word is only the difference that distinguishes it. one is in real form and the other is invisible, but again both are very good and profitable investments. But if the problem is clearly different, the real (gold) is not really, but the unreal (ethereum) is very full of risks, but behind the full risks, there are certainly trade-offs with greater benefits.
in fact, they both have value and are only needed in different places. both can be turned into cash in different ways. gold will be a long-term investment and so will ethereum.