I'm undecided, honestly. I love the WP platform. I love the tiles. I love the simplicity. What I don't like is having to always tell people "no, sorry, I don't have that app" or "no, I can't do that, I have a Windows Phone."
I recently (2 months ago) picked up an iPhone 6 Plus, and it's a very solid device. Yes, it has a TON of apps that I'll never use, but all of the important ones (and more important than that, all of the ones all of my friends and family use) are there. Yes, it has the same icon layout as it's always had, but it's VERY fast, and very fluid. The extra half second I wait for my 830's screen to turn on and unlock means I'm already in the app I was looking for anyway with the iPhone. Bluetooth seems to work better in my car, where my 830 (all 3 of them that I've had) is horrible in that regard.
Mobile payments.... I can't tell you the number of times I have left my wallet in my laptop bag or in the center console of my truck, but didn't go back for it because I could make my purchases anyway because I had my phone on me. It just works, and it's once again, very fast.
The camera quality is not equal with WP's PureView models, but the pictures are still very good, and I can burst capture and record slow motion video like no tomorrow, with no 3rd party apps necessary. Having a two-year old son who is extremely active, this is a huge plus.
Overall I feel like while I love MS and WP, the platform still has a very long way to go in catching up. They have a lot of desirable features and overall I like the tile system better (I don't know who wouldn't) than static icons, but the fluid and seamless experience you get with the iPhone is really hard to argue against. Trust me, I hate saying that, but it's true.
I'm really hoping to be impressed with the 950 and 950XL, but I'm not holding my breath after being on the other side of the fence for the fist time in years (I was a WP convert from the hardcore Android ROM world with the first HTC Titan, and have owned Lumia 900, 920, 1020, 1520, 830, 640XL), and MS has made that transition very easy by allowing ALL of their apps and services on those other platforms that work equally well. The advantages of having more than you "need" seem to outweigh being content with what I have, in my case. I know that if I need to do something that would be out of the ordinary for me on WP, I can do it now, basically no questions asked.
I'm torn. I'll probably pick up a new WP to play with the new hardware, but it will really need to provide a compelling experience for me to go back full time.