It's hard to just favor one and completely disregard the other. If I were to choose, I'd choose both. But suffice it to say that I'm not investing in gold right now. It's just that while there is indeed abundant gold in this world and even outside, I don't think it will lose its value in the next hundred years.
Anyway, I agree that Bitcoin isn't really comparable to both gold and diamond. In the case of both, I believe the earth won't be running out of supply even in the next centuries. With Bitcoin, everything's fixed. And it will run out at some point.
I agree with you to a point but the fact that we both do not invest into gold, and do invest into bitcoin proves that even though in logic we feel like they are both nice, we still prefer bitcoin over gold. I cannot really say this with certain idea, I mean maybe we do not but it feels that way to be fair.
I do it, I invest into bitcoin and not into gold and feel like they are equals in my mind, but if they are so equals then why am I not in 50% gold and 50% crypto? This feels like a proof that our generation prefers to be more digital and the idea of a physical gold being valuable doesn't really come to us as a reasonable approach as much, and digital gold doesn't feel trustworthy.