What is better for Photography editing, Lightroom or Photoshop?

The answer depends on what you want to do with your images, and whether you need other, non-photographic tools. All manner of professions use Photoshop

for a photography i would prefer the Adobe Lightroom because it made for that. if you use photoshop its okay but its only use for post production or compositing. Lightroom you will have all the data from the original file of yours in your camera, if your file is HDRI you will see all the data their, or OpenEXR, 

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I'm into Photography and videography work and I can tell you from my experience, Lightroom is ideal for fast editing with it's simplified GUI that expanded over Adobe Camera RAW.  

Photoshop is the big daddy for detailed work like Photo-retouching/enhancement works with more features and availability of plugins, Photoshop is a better choice.

One thing for the future is iPad will have more tools so you'll have editing toolkit on the location beyond the desktop limits now. That's what I have been using for quick client turn arounds of Event Photography work.

I hope this was helpful. feel free to contact me.

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if you capturing in raw >> Lightroom will give you more options if you dont have the extended version of photoshop witch contains the camera raw program but if you have camera raw in your photoshop version lightroom will be useless specially if you are professional in it photoshop give you the ability to Edit specific areas and little parts you can control what every pixel  >> this isn't in lightroom  

Lightroom is the best for the photo editing as a proffesional.the lighting effects are very perfect .

Lightroom

depend what you have do do . if its fast editing only for light, color, crop and classify Lightroom will be enought , if you need to modify the photo more than the light you have to use photoshop you can classify the photo in Lightroom and use photoshop for editing and come back to lightroom for the presentation

Lightroom because it's more specified for photographs 

for photographers best software is lightroom no doubt but if you're graphic designer or U.I designer so photoshop is a best choise for creative minds.. 

Lightroom is good for faster editing and  better user interface. But for specific details like portrait picture enhancement with more features and availability of plugins, Photoshop is a better choice.

But you can use both, start with LR for adjustment of white balance, and other basic adjustments (exposure, shadow etc) then export it to photoshop for the refinements.