It depends on what changes they made from one year to the next. Compare the frame specs, geometry, build kit and components . . 1×11, 2×10, NX1, GX1, XO1, boost hubs, forks, brakes, etc. If everything’s the same or better, get the older model at a lower price. I bought a marked down 2016 in December for a $1000 less than it was in November, the 2017 is basically the same bike in a different color.