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OP, if you invest in either of these two things, gold and bitcoin, you will definitely benefit from holding it. But I think in today's era if you keep up with modernity you can definitely invest in Bitcoin. Also, if you invest in gold it is also better to hold it you will definitely gain in the past people always invested in gold when there was no bitcoin. I think it never hurts to invest between these two things, gold and bitcoin, so you can invest whichever you like.
OP, it sounds really funny that you're imagining investments from 20 years ago here, lol. We know that Bitcoin came into the market in 2009 and since then people have invested in it. 20 years ago there was no sign of Bitcoin You may be very ignorant about this, but we can assume that in the future we will celebrate 20 years of Bitcoin.