That's depend on you and what your uses and what you like but kali linux is more secure and light and fast operation systeme but it's need some skills to use it
If you are intresting in kali linux and want to know more follow me on instagram @hacking__tips . Thanks
Linux
Linux RedHat
SUSE Enterprise Linux
The best OS for hackers is Backtrack Linux 5.
Linux is the best operating system in the world, Linux is Open Source, Secure, Stable, License Free and also multi platform supported OS and shipped with thousands of FREE applications.
Red hat linux is the best to learn and use if you want a stable operating system.
Windows or Linux would be the best system for watching movies online.
Linux Mint to learn. Ubuntu for gamers/programmers & Kali Linux for penetration testers and hackers.
Windows, Mac and Linux Solaris but it depends upon the using of Operating system And antivirus.
Best way is to install it on virtualbox or vm workstation .
Not really, it's depending on what do you want. I suggest Kali Linux for penetration testing/hacking and Ubuntu for gamers/programmers.
Kernel, but I guess when you will learn, you will have to switch (Ubuntu for programmers and gamers and Kali Linux for penetration testers and hackers)