In your opinion, which is better overall? My wife is almost due for an upgrade and she wants an iPhone. Is the 6s really much better than the 6? MTN has a sweat deal on the 64 GB iPhone 6 for R450, which is more in my budget, but the iPhone 6s 64 GB is still R600. I know it has a better camera and processer, but is it really worth an extra R150 each month. She wants an iPhone mainly for its camera