New vegas has better exploration and world building and questing, and thats like 90% of the game, so its really no contest. Fallout 4 is an abomination.
I did like the power armor better, but i hated the retarded mechanic attached to it, so i didnt get to enjoy it.
Better exploration? No. New Vegas was a linear game, unless you cheesed your way north of goodsprings. Fallout 4 has a far bigger map and you are free to explore it all as you see fit. I don't see how it has "better exploration", unless we have different definitions of what "better exploration" is.
Better world building? I will give you that. New Vegas settlements had more character and there were more of them. Also more and arguably better NPCs. Surely the world in New Vegas is more memorable, the factions, the NPCs, the quests. Sure. I agree with that.
But as a game, that means, GAME-PLAY, Fallout 4 was league aheads of New Vegas, sorry. And that IS 90% of the game... When i want to shoot zombies to let off some steam, i play FO4, not New Vegas. New Vegas gameplay is a fucking chore and i hate it. I liked the worldbuilding and the quests but i have already done them, no need to replay-them if the gameplay is not enjoyable.