Based on the type of photos I like taking, a phone camera was not an option. For the last few years, I've been carrying a Mirco 4/3 camera which is a mirrorless camera that takes inter-changeable lenses (made by both Olympus and Panasonic). It's essentially a tiny DSLR without the optic view finder.
Since I'm not using my phone as a camera or GPS, I don't need to carry a battery pack to recharge my phone in the backcountry which helps offset some of the extra weight of the camera; but obviously not all of it. Many thru-hikers still carry a stand alone camera along with their cell phone; usually a point and shoot, though a few carry either a mirrorless camera like me or even a DSLR. It really comes down to the sort of photos you want to take. For some hikers, a cell phone camera is all they want or need. Know what you want to get out of your hike. Just make sure you have no regrets later. A cell phone camera may be all you need, I just want to make sure you have thought about it some before you make your decision since electronics can cost big money.
If your think you really might be missing out on something by using a Windows based phone, then maybe you should wait and see what other phones come out over the next 3-4 months. You don't need to rush into it unless you need a new phone now. I've been using an android for a couple of years and have invested money in android apps. So for me, I'd have to spend more money on new apps if I changed to apple or windows OS. Consider how that can lock you in before choosing a phone OS.