I think Zen 2 is exciting. There's clearly a lot of potential there, and we just saw the tip of the iceberg. Vega 2 is a little less exciting, but it does give you the opportunity to get off of the nVidia platform. It's more of a "side-grade" from a 1080Ti, and would let you to properly use Freesync monitors with proper driver support. Also fuck RTX, that shit is useless right now anyways.