Nintendo makes great games, but it's not just about the games anymore. What makes PS4 so enticing for me is that beyond its huge library, there are also tons of deals they give out as well! I'm fairly certain there are deals on given out every weekend; good, high quality games, not 3DS shovelware. Not only that, but with PS4 you get free games every month, often times great indie games.
With Nintendo, you need to cough up the dough in order to play practically anything. Nintendo Selects are nice, but they don't usually come until the console is ending its lifetime.
While the Xbone and PS4 are more expensive than what Nintendo has to offer, they're actually cheaper alternative if you game often. Nintendo game prices are high af and never go down, often times going UP!