Question Back on Stock 4.3 OTA update to 4.4.2 available.. Should I?

Since i'm already past 4.2.2 and i'm sure Knox will be installed with 4.4.2 as well should I upgrade?
I just got back on 4.3 stock to try and fix a cellular call sound issue (which is still happening though )
Is 4.4.2 so much better than 4.3?
I almost updated but then I thought back to when i did that from 4.2.2 to 4.3 thinking "hey, why not"

Advantages? Drawbacks? I appreciate you guys feedback!