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I am using backtrack right now but i also wish to switch to kali linux if its more interactive. Because i am just a beginner pen tester. I tried with both bt4 and bt5, but novice in kali linux.
That's a nonsense question, since BackTrack and Kali are the same, just Kali a higher version.
It's like asking, Squeeze or Wheezy? Both are the stable versions of Debian but Wheezy is more updated than Squeezy, and with longer support.
Kali is newer, more recently updated, and installs rather than being a liveCD. Pretty much all there is to it.
Kali is best if you want to set up a machine for pentesting especially.
Neither Kali nor BT offer anything that you couldn't assemble onto your own favourite distro to be fair.