I am a Nova Prime fan and it's usually the first thing I install on all phones, with the second being SwiftKey.
I fell "in love" with Knock Knock and having to tap on the notification bar was a pain in the rear so I decided to try the stock UI. To ME, it is important that I have more than 3 of 4 apps in the dock. Once I realized that the LG UI allows more apps to be placed in the dock ( I have 6 now including the app drawer icon) I was able to make the transition to stock UI with no problems.
There are some things I miss about Nova and I still run it on my G Pro, the S4 and even on the Moto x. The G2 and the One are surprisingly good with stock UI.