Unless you want compatibility with Gear (which is not guaranteed) or think that 4.4.2 will fix some bug that's present in your current setup, the answer is that there is nothing substantially different. I am running official 4.4.2 on my Galaxy S4. Outside of the information bar icon color scheme and the fact that most apps can no longer access the SD card, nothing is better, faster, etc. It looks, feels, and performs exactly the same.
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