Can you explain why coins with low circulating supply is looking any better than a coin with high circulating supply ?

It's all about the market cap, right ?

If you put 1000 dollars in a coin with a low supply it will double your investment if the marketcap doubles and it is the same with the high supply coins. So basically it does not matter.

Can anyone explayn why everyone is allways hyping coins with low supply like you can gain more money with it ?