Silver's use is rather limited
And these limits are twofold. First, there is in fact not much use for silver in today's economy on its own, and, what adds more injury to insult, it is not going to expand in the future (if anything, palladium seems to be a better choice now). Further, even whatever industrial use silver has, it is severely limited by its price which is to say the smallest rise in price will make this use shrink since silver can be easily substituted by other metals and materials. Indeed, silver is the best electrical conductor out there, but copper is not bad either, so it is just a matter of price
Why do you think that Palladium is a good choice when compared to silver and platinum? I know that it is used in catalytic converters, but how can you say that in future the demand for Palladium will increase?
That's actually a good question. Personally, in the example you provided with palladium's use in catalytic converters, I see the demand for that use decreasing as more auto makers begin pushing electric or hydrogen-fueled vehicles out and the inevitable decline of gasoline powered internal combustion engines takes hold.
Plus even if demand goes up so do efforts to mine it, you need to look at supply aswell not only demand.
Just kidding, for me they are both good to have and choosing gold is nice but in reality it is hard to have those especially if you are like me. I do not have the capacity to buy gold unlike bitcoin wherein I can earn it. You cannot earn gold, as gold it is. But bitcoin can be earned and can be used to buy things. If I have many bitcoin then I can have and buy gold. And gold value does not always rising up. 
