The XBOX ONE is the best choice for console gaming, if you have high speed internet and $6,000.
If you don't have as much money, the PS4 is the runner up.
The WiiU is almost complete crap and far behind when it comes to the other consoles. Especially when it comes to online gaming, video streaming, and communication features, such as having to open another channel to send a message to someone, instead of simply opening up the console menu in the middle of a game.
Overall, I believe that PC gaming is by far the best. You can customize the hell out of your PC, the quality is absurd, and you can make it look like something straight from science fiction. The only problem is the cost, and the amount of time needed to assemble it, if your making a custom one. But a gaming PC can be anywhere from just $250 to nearly $30,000, but they typically are around $1,500 to $4,000.