Why shouldn t I buy an iPhone 6s?

I use my phone for everything and it organises my life, so the new one has to be something that is reliable, practical and powerful. I've never owned an iPhone before. Only old style Nokia and Samsungs, plus Android smartphones.
I like my tech a lot and keep up to date with phones etc, and value having the latest and most future proof device. I don't want to wage war on the whole android vs ios crowd. I've never owned an iPhone so can't judge.

The main reason IIm considering an iPhone now over an android is long term reliability. My Moto G has become slow and glitchy after 18 months. IPhones seem to stay as new performance wise from what I've seen for far longer. Given that my life is on my phone and I rely on it, I want to trust it to work and not have software crashes.

's a killer contract I've found for a 64GB iPhone 6s in space grey for £31 every month (£75 upfront) with 3GB data and unlimited calls and texts.

If you re suggesting an alternative, I need something with a good processor, no horrible android overlay, and a top end camera. And it has to be available with a good chunk of allowances (esp data) for no more than £35 pm with max £100 upfront.

Give me a good reason why I shouldn t buy the iPhone because that s my current top and it's tempting me to damage my wallet

Cause it sucks