Replaying New Vegas now, and while i agree that the dialogue is better and feels more in touch with the original Fallout games. I feel like its to easy to meta-game it, i know i set my own limits, but in one hour i was idolized by the Boomers because i listened to their story and killed a few Ants. The factions system feels uncomplete and very tacked on. Fallout 4 has a much better approach to factions, in my opinion.
I will say that i find the East Coast setting much more interesting in general and its an oppurtunity to build up something new and have it clash with the West. The Brotherhood of Steel versus the NCR. Can you imagine that game? Holy *put in censcored word here* I am more interested in the setting as a whole and where it will go, compared to dialogue etc.