iPhone 6+, Note 4, One Plus One, or Nexus 6

I already have the S5 and I think it's an amazing phone but I'm not listing it since I already have it.

iPhone 6+: I only want this for the camera
Note 4: Overall round product. Has pretty good stuff everywhere but doesn't focus on one aspect as some of the other phones
One Plus One: Amazing specs with customized software that you can easily change to whatever you want
Nexus 6: Nexus phones just have their nitch in me for some reason. Not exactly sure why I want one.