I just comparison shopped the 2017 FX3 versus the 2018 FX3, and I only considered the rim brake models. The only differences I could see were that 2017 model has internal cable routing, with 2018 going back to external cables, and 2018 has a matte paint scheme, while 2017 is glossy.

I liked the look of the paint on the 2018, but I was able to get my LBS to knock off $75 on the 2017 and I do like the cleaner look with internal cables. Have only had it 2 weeks, but I've been really happy so far.