Will the money in trillion of Dollars be shifted to Bitcoin from Gold in future making the later less redundancy or the two are not competitive to each other?
No one really knows, but as bitcoin improves in the long term, I think a significant amount of money will move to bitcoin; though not 100%, because gold still has unique use-cases that bitcoin doesn't have.
Why is always the question which one is better to HOLD (Bitcoin or Gold).
Depends what your goal is. If you want a speculative investment that could potentially rise or drop huge percentages, then hold bitcoin. If you wanted something that's truly stable and that can work really well as a store-of-value, go with gold(for now).
What is the danger of HOLDING the two?
With holding gold, you'd have to trust a custodian to hold the gold for you. Well, you can hold the gold yourself but I'm not sure if that's a good idea security-wise. With bitcoin, there is no custodian(assuming you're using your own non-custodian wallet), but the risk comes if you aren't decently tech-savvy and you have no idea from protecting yourself from hackers.
Can one outsmart the other in the near future, I am just keen to know due to a lot of argument around these two commodities.
Not sure how assets can outsmart themselves lol 🤷♂️