Which one is much good Nexus 6, Samsung Galaxy Edge or Iphone 6 ?? In Terms of Performance and Camera

Solution
The iPhone camera is generally considered one of the best all around smartphone cameras.

http://www.forbes.com/sites/amadoudiallo/2014/10/01/iphone-6-camera-review/
well iphones are very simple and minimilistic and i would see myself personally getting bored of an iphone in a year probably, nexus 6 is a great phone, but i would recommend samsung galaxy edge, edged screen will come in handy, greatttt camera, and good build, removable back for extened batteries, and replacements, good if your battery is old and you need a new one,.. so i recommented samsung note edge
 
To give a fair answer, all three phones will produce a pretty high quality in more situations and light conditions when compared to a lot of other smartphones.

The iPhone 6 has a really true-to-life sensor to end up producing realistic colors, taking quick photos, and generally does pretty good with cleaning up noise in the post-processing portion. All of Apple's phones have always been pretty decent, at least iPhone 4 and on I'd personally say.

The Nexus 6, while the camera on this model is leaps and bounds better than the Nexus 4 or 5, it still isn't a top tier camera from my personal experience using it. You could definitely expect a great shot with it during the day while outside or in a well lit room, but out at night you may be relying on HDR to get your pictures from coming out with an intense grain (and you may still end up with poor results)

Now in the case of the S6/Edge, it's still using another 16MP sensor like the S5 did, but it's boosted it's shooting prowess by adding actual Optical Image Stablization (something the Nexus 6 and iPhone 6 plus also offer), and bumping the aperture to a F 1.9 lense. Comparing that to the either Nexus 6 or iPhone using a 2.0 aperture, the .1 difference actually results in a slightly better low light performance for it's front and back cameras. I was really surprised by the difference, personally. My only personal gripe with Samsung's post processing is that I feel pictures come out overly saturated at times, though.. this can be an objectionable thing depending on the person taking the picture.


I'm not exactly a camera expert, but I do work around tech, namely smartphones and tablets all day and I'd say all 3 would be safe bets for cameras.

Also, afterthought:

iPhone 6's one downside versus the other two would be the lack of support for 4K Video recording. It's not a super pressing issue at the current moment in time, but about a year or now it's going to be hard to push a smart phone camera without it, as more people start buying 4K TV's.
 
I mean, having used many Samsung phones, Nexus ones.. I personally don't mind overly saturated images at least with group pictures and the like, as having saturated positive memories definitely doesn't have to be a bad thing. :)