I wonder how different things would be if previous people came back to be the directors of the games. Interestingly though, Masuda directed the BW games, but also XY, so he must have changed his beliefs in favor of the idea of mobile games at some point for Gen 6. Who knows if the previous directors have changed their beliefs towards that as well.
Just for reference, the directors of what are considered the “best” games were:
Takeshi Kawachimaru (Platinum)
Shigeki Morimoto (Emerald and Heartgold/Soulsilver)
Takao Unno (Black2/White2)
That's a tough call. But I probably have to go with Morimoto since Emerald and HGSS are great but B2W2 is a close second. I wonder why Unno hasn't directed a game since than, it's so good!