every crypto is different and serves a different purpose. Chainlink provides real world data onto the blockchain so that smart contracts can be executed, so sports betting/insurance/payroll/price feeds/marketplace or any real-world agreements can automatically be executed on the blockchain without the risk of one party breaching/manipulating/not following through on the original parameters of said agreement.
If you want to think of Bitcoin as currency, there is a fixed amount, thus you can't keep printing more. Anyone anywhere in the world who has internet access can send and hold it from peer to peer (be you're own bank) within a matter of seconds/minutes, and the blockchain is a public ledger, so all transactions are verifiable.
The real investment is in blockchain technology and what certain companies are doing with it.