The main difference being is that BTC is fixed and limited in supply, whereas paper / fiat money is not.
Interesting that ZCASH never got the traction of Bitcoin. ZEC also has a finite supply of 21 million, like Bitcoin. In addition, it offers better privacy than Bitcoin, so your transactions are not exposed. In 2017/18 the price ran up to $700. Then it crashed, rebounded a little in 2021 and is now back at $25. I think the reason is governments don't like the opaqueness of Zcash or Monero, and miners / investors have therefore not really gotten involved with it on a larger scale for fear of a crack down perhaps. And institutions prefer more transparency.
I mined a little Zcash for a few weeks in 2018 but quickly switched al my rigs to Ethereum. Glad I did, that would have been a huge loss. And yes, I did pay taxes on the mined ZEC. If I cash out on that now I would probably get a little tax loss to offset any other profits.
Point is, the finite supply narrative is only part of the story. There are even less Monero XMR in circulation than BTC - 18.38 million. It has a very low inflation which is set to go to 0%. It was founded in 2014 and even with it's small inflation only grew to 18.38 million. And it's privacy features are way better than Bitcoin.
What is Zcash?ZCash (ZEC) is a fully anonymous and decentralized blockchain and cryptocurrency. Transactions on its proof of work blockchain are untraceable because of zero-knowledge cryptography. It was created in response to, their words, bitcoin’s flaws. It uses the same algorithm as bitcoin but then in combination with semi-transparent processing, to avoid the transparency of bitcoin. The user transaction data is revealed selectively.
The goal of ZCashZcash is developed to overcome bitcoin’s privacy “flaws” and uses zero-knowledge proofs to verify and validate transactions. ZCash’s blockchain aims to provide practical utility for businesses and large organizations interested in systems that combine the benefits of blockchain technology with privacy.
Who started ZCashIn 2016, ZCash was founded by Zooko Wilcox-O’Hearn in response to demands for an open financial system with added privacy features. Zcash’s roots lie in Zerocoin, which was developed in the 1980s; ZCash was initially launched as Zerocash back in 2014.
What is Monero?Monero (XMR) is a cryptocurrency which focuses on being untraceable and private. It differs from Bitcoin's in a few key ways, but is very similar to Bitcoin: it’s an anonymous version of Bitcoin. It can be used to buy and sell things, and be exchanged for other coins or tokens.
The goal of MoneroThe privacy features of Monero gives it its most value. No one can link Monero cryptocurrency transactions to a person. Monero is also created for its fungibility, all Monero coins are identical and mutually interchangeable. Monero has dynamic scalability, which means it has no “pre-set” block size limit. Monero has ASIC resistance and multiple keys.
Who started MoneroBytecoin, launched in 2012, was the precursor of Monero. It was the first digital currency that was written using a technology called CryptoNote. CryptoNote is the spine of most of the privacy-based cryptocurrencies that exist, including Monero. However, there were a few issues with Bytecoin, which lead to a group of seven developers to fork the Bytecoin blockchain. The new currency would be known as Bitmonero, later named Monero. Five of the seven developers decided to stay anonymous. Only two of these Monero developers are known: Riccardo Spagni and David Latapie.