oh...the important decisions in life
I've never had a problem with my samsung...
how is the camera on an S5 and S6...and how is it on the apple equivalents?
Camerawise, they are different, you can't say one is better than the other. The S5/S6 have 16MP external cameras, and 5MP seflie cameras, while the iPhone 6S has an 8MP external camera.
But, the amount of MP (MegaPixels) don't really affect the everyday user because they aren't going to print it, or edit it very much. The only people who need to worry about MP are wedding photographers, or people who need to print various sizes of pictures, with great quality. Also, the thing that really matters for picture quality is the sensor. Phones nowadays have a 'camera bulge', that's because the designers are trying to fit the largest sensor they can into it.
Basically, all modern phone cameras are pretty good for things like random shoots, but nothing serious if you're going to be printing and selling or whatever.