Should you consider an EVM or build a custom blockchain from scratch ?

EVM :

The EVM is the part of Ethereum that handles smart contract deployment and execution. At a high level, the EVM running on the Ethereum blockchain can be thought of as a global decentralized computer containing millions of executable objects, each with its own permanent data store.

Smart contracts are self-executing contracts that are agreed by buyer and seller and directly written into the lines of code.

The code is stored in a decentralized distributed database system called a blockchain. Ethereum’s vision is a censorship resistance and self-sustaining network of computers.

Ethereum software run on a network of computers and all data and smart contracts are replicated and processed without involving a central administration.

Example :

Digital identity
The way we identify ourselves has barely changed in the past 5 decades. We still use passports, that are still made of paper, that we still need to carry around everywhere. One of the main reasons why we have not shifted to a digital system yet is that it’s hard for Governments to check the authenticity of an online document… Until now.

Ethereum enables the verification of data in an open and transparent way, which means that it could also be used to pioneer the creation of a digital identification system. Companies like Civic have realized this potential early on and are already working on making this happen.

BLOCKCHAIN

A blockchain is essentially a distributed database of records or public ledger of all transactions or digital events that have been executed and shared among participating parties. Each transaction in the public ledger is verified by consensus of a majority of the participants in the system. And, once entered,
information can never be erased. The blockchain contains a certain and verifiable record of every
single transaction ever made. To use a basic analogy, it is easy to steal a cookie from a cookie jar, kept in a secluded place than stealing the cookie from a cookie jar kept in a market place, being observed by thousands of people.

Blockchain technology is a software; a protocol for the secure transfer of unique instances of value (e.g. money, property, contracts, and identity credentials) via the internet without requiring a third-party intermediary such as a bank or government
Email over IP, Voice over IP, Money over IP

EXAMPLE

Bitcoin and Ethereum are popular examples of blockchains.

WHICH IS BETTER EVM OR BLOCKCHAIN

EVM and Blockchain both are very unique with their own style EVM in that we can save much as we can while blockchain is having certain limitaions . EVM is already built-in the only thing is we are going to use it while blockchain we are going to develop it from the scratch so it is quite time consuming and expensive. So EVM or Blockchain both are better we want choose one wisely by the use case of those .