It depends on the purpose of what you want to use. Kali Linux is a Linux distribution that is designed for professional testers and security experts. If you are not familiar with Linux or if want to use for development, web design, gaming, etc. Kali Linux is not recommended.
If you want to use for penetration testing, you can use Kali Linux as the main OS. If you just want to get familiar with Kali Linux, use it as a Virtual Machine. Because, if you face any issues using Kali, your system won’t get harm.
If you are interested to learn Linux, I suggest this Linux Course by Intellipaat. You can even check Ethical Hacking Training to use the full potential of Kali Linux.
You can watch this video on difference between Kali Linux and Parrot OS to know more about Kali Linux:
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