There is no comparison between stock Kindle Fire OS and Android KitKat. They are completely different operating systems. Kitkat is 100% better. But I am biased because I hate the Fire interface. My son (13) didn't hate it, he didn't care about it at all, but when I put kitkat on his Fire, he was very pleased, and he would not go back. It turns the locked down plodding Fire into a true android tablet. The way I did it, it is basically the n2a skin, but that is fine.
Yes it can be done without n2a, but that may be difficult for the average person. So I do recommend the n2aOS method for the average person. (Believe me, I have spent hours trying to put kitkat on my Nook HD+ and no success. But I was able to easily put n2a KitKat on my Nook HD).
So anyway, I used to really dislike my 2012 Fire HD, but now I love it. It is as good as my 2013 Nexus 7.
Here is the website.