Take gold for example, gold was way in existence before Bitcoin came into play, but the value of Bitcoin has beaten gold tremendously.
Bitcoin value is very volatile, meanwhile Gold value is more stable. That's a little reason that Bitcoin can increase its value faster than Gold. However, Bitcoin price can decrease quickly, too. Just look at the current price, it is far from its ATH in the previous year! Meanwhile Gold value doesn't decrease as significant as Bitcoin value.
I am currently looking for altcoins that could have a good future potential just like Bitcoin, as I plan on buying them to hold into the future for great future profit.
I have no idea about this. I don't see any altcoin that has the same characteristic as Bitcoin. I only can consider Bitcoin as the safest crypto coin for holding a long term. Meanwhile altcoins, they are better to hold for shorter time of period. Altcoins are more difficult to predict, they also can be dead coins if they experience big problems. So, it is too risky to hold altcoins for a long term.