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I use both LR and NX2, both can be used to great effect, but which product you use will depend on your workflow and needs.
I don't follow the view that NX2 produces better files than LR, if you are skilled in either program you will get comparable results. For me if I start with a decent image in terms of WB, exposure and used the correct picture style at capture time, I get quicker results initially in NX2 as I make use of picture styles, ADL, ColorEfex filters, control points etc.
To get the same result in LR requires that I do more work setting LR up before hand, generating camera profiles to get the colors right (use passport checker for this), set up presets to mimic the Nikon picture styles.
However if I have a photo that is not great to start with, WB and exposure very off, noise an issue, highlight recover needed, I find it very hard to correct it in NX2. Some of this is because I don't like the interface and I'm more use to working in Lightroom.
For processing lots of photos LR is way ahead of NX2. This is why I use LR for doing most of my wedding work.
The other reason I use LR for the bulk of work is that it is updated more often, when Apple updates the OS for Macs, you can bet LR will work fine with the new OS fairly quickly, Nikon can take months and months before they correct the problems that NX2 can have with a new OS.
I use Photomechanic and NX2 at the start of workflow to sort the images and take the images to "proof" quality. But after this I use Lightroom to do the bulk of work and take the images to the required final quality. I could live without PM and NX2 but could not same the same about Lightroom