Accourting to my analysis I come to conclusion both are best OS for penetration testing because,
✑Both can be used for penetration testing.
✑Both operating systems support 32 bit and 64 bit.
✑Both have Cloud VPN.
✑Based on Debian development standards.
✑It comes with pre-installed weapons of hacking tools.
✑Both operating systems support embedded and IoT devices
But the kali Linux takes more than specifications parrot OS. But still, I have more Doubt about this topic. if any relevant person here please let me know which is the best and which is easy to use.