Hey! I was in your shoes moments ago. With around the same difference in price, if ergonomics aren't the deciding factor for you I'd go with the cheaper body.
I went with the X-T10, heres why:
- Cheaper, while not feeling cheap at all. (More money to spend on glass)
- Smaller, I'm downsizing from a D5100 and the X-T1 with equivalent lenses wasn't much smaller and only 120g lighter.
- I handled both in a shop, and didn't think I'd be unhappy with either options. The viewfinder on the X-T1 is better, but tbh it's hyped up!
- Weather resistance , I hike a lot in good and bad weather. Sure the extra peace of mind is great, but I've previously never owned a weather proof camera and never had issues. Be smart, don't shoot in a downpour, use a plastic bag and invest in a dry bag. Also see if the lenses you'll be wanting are WR, if not, your camera ain't sealed.
- Both will produce the same image quality as they are the same on the inside.
- Missing ISO dial? Program that extra Fn button to the dial and iso sorted, much simpler that the locking pin situation on the X-T1.
Factors where the X-T1 trumps:
- Higher burst rate
- Battery grip (if you need it)
- WR (From MPV not a necessity, but nice to have)
- All metal body (for when you can't find a hammer)
If nope of the above is a requirement, do you need the X-T1? No. Do you want it? Maybe. Only you can decide. Also note, both are rubbish for video, if you were wanting to go down that route, with your budget the sony A6000 is a safe bet. The Fuji X-T20 is an option as well, but a lot more obviously.
Check out this video, he compares them brilliantly, but still leaves the final decision to you:
Best of luck, try not to obsess over your choice too much, I know I did!