Based on the history of moonroof reliability I opted not to get a moonroof. Plus it makes the top of the car heavier and lowers the roofline.
For the seats, it's really hard to say. I wouldn't get this car without the Recaro seats. I think they are perfect for me. I am 5'9" and 180ish. My friend and uncle are wider and both around 6' and they find it very uncomfortable. Then I had a couple in shape tall people get in my car. Unsure of weight, but one 6'8" (since mine has no moonroof) and he slid in as if it was his Superduty and didn't complain about the seats being too tight and the car only had 160 or so miles on it so the seats weren't broken in. Two others at 6'5", one fairly skinny and another with a little more weight to him (probably about my build, just taller). The skinnier one liked the seats and the other didn't comment they were too tight. All that said, that probably doesn't help you much, but with so many different builds of people it's hard to say if you'll be ok with the seats. With me, I leave my wallet in my back pocket and for regular commutes I have no issues with it. If I'm doing a longer drive then I have to take it out and throw it in the console because it starts digging in. The seats do loosen up over time from getting in and out of them. There's a significant amount more tightness to my passenger seat than the driver seat at 12k miles because I rarely get passengers.
There is no green for the '16 or '17 so if you're really attached to that color I'd go with the '15. And the green is really pretty awesome and really uncommon. Only reason I didn't go for it was because I really wanted the molten orange just a bit more and the '16s didn't come with a green option anyway. I haven't been blown away with my Sync 3 system. Not sure if mine is defective, the MyFordTouch system really was extremely terrible, or people just don't know what fast is. I wouldn't describe my Sync3 system as fast like a good smartphone (even though I currently have a garbage cheap smartphone). It takes a bit for it to respond usually and sometimes doesn't register my touches at all which is extremely annoying trying to use it at all when driving and still very frustrating when stopped. Honestly it sounds exactly like the MFT system was said to be with a different skin... It has required me to factory reset it once and infrequently glitches out and says it's playing my USB flash drive but it's playing FM radio and the only way to fix it is to turn off the car and back on. I have considered going to the dealer to test a new Sync3 system to see if there's any difference in performance between theirs and mine.
So besides my rant...the colors of the car, wheel colors, and Sync 3 vs MFT are the main differences between the '15 and '16-'17. There are newly released color offerings for the '17 model if you wanted to order a '17. If you get a '16 make sure the cooling fan relay is grey and not black. If it's black it's an early '16 and that relay will eventually burn up and require replacement of the wiring harness (and the cooling fan won't work so possible overheating). So have them replace it at the dealer if it's black.