2014 was a higher level from Roger and against a stronger opponent. Roger still had his legs under him in 2014, and that match was arguably his best match of the year from a total performance standpoint. I don't know if there are any other matches that year where as a whole he was firing better on the forehand, backhand, serve, volley, twitch reflexes, point construction, and execution. That being said, to me it is still a diminished forehand compared to the way he could stroke it with the 90. With the RF97 in that match it felt like he was always thinking one shot ahead every time he hit a forehand. Compare it with most matches where he played Djokovic with his 90, for example 2010 Shanghai. There were so many points where it looked like Roger just said "okay I'm done point constructing and I'm just going to blast the forehand". It felt like he didn't have a shadow of that level of confidence on the forehand wing again until AO17. As a whole 2014 Shanghai was the better Federer, but the best sum of the parts would be 2014 movement, rally balls, and serve, and 2017 reckless abandon and feel on the "tee off on neutral balls" forehand and backhand. Volleys are a wash because Roger's always exceptional at net regardless of year.